地質(zhì)工程方面外文翻譯--濟(jì)陽坳陷古近系一新近系地層油藏形成機(jī)制與分布規(guī)律-其他專業(yè)

1、中文7700字Formation Mechanism and Distribution of Paleogene-Neogene Stratigraphic Reservoirs in Jiyang Depression Abstract During Paleogene-Neogene period, multiple scale unconformities had been formed in Jiyang depression, which provided favorable conditions for stratigraphic reservoirs. In recent yea

2、rs, various Paleogene-Neogene stratigraphic reservoirs in Jiyang depression have been found, and proved reserves were rising significantly, which fully showed a great exploration potential for this kind of reservoirs. But the practice of exploration in recent years indicated that the unconformities

3、carrier system and its ability of sealing, petroleum migration and its accumulation model, distribution of stratigraphic reservoirs are uncertain, which deeply restrict the exploration degree of stratigraphic reservoirs in Jiyang depression Based on the analysis of a large number of exploration well

4、s and seismic data for Typical reservoirs, the paper analyses unconformities construct and its effect to generation in the PaleogeneNeogene, and summarize the distribution pattern of stratigraphic reservoirs based on petroleum mechanism and accumulation model. Finally, a highly quantitative predicti

5、on modclof height of pools in stratigraphic reservoirs was established, the research results effectively guided the explorationPra- ctice of stratigraphic reservoir . There are four macro unconformity types of PaleogeneNeogene formation which including truncation-overlap, truncationparallel, paralle

6、loverlap and paralel unconformity in Jiyang depression.Besides truncation-overlap unconformity lies in slopes of depression, and parallel unconformity developed inside of depression,another two types lie in local areas. Unconformity can be developed vertically three-layer structure which including u

7、nconformity roof rock, weathered clay layer and semi-weathered rock. It also Can be twolayer structure if without weathered clay layer.And part of semiweather rock Can be form a hard shell accuse of its filling process during the later stage. Geological characteristic of the structure layer of uncon

8、formity is different in lithology,mineralogy, element geochemistry and weather degree index. Based on optimal partition of sequential number and principal component analysis, logging quantification recognition method about unconformity structure layers were established, on which effective identifica

9、tion of unconformitystnlcture layers can bu achieved in the case of no rock core. The formation of various unconformity structure types is related to many factors such as, parent rock lithology, interval of deposition hiatus, palaeotopography,and preservation conditions, which aretogether to control

10、 spatial distributions of unconformity structure types . Macro styles and its vertical structure of unconformity can be effected as a blocking, reservoir, trap or carrier system.Blocking affection to fluid depends on weathered clay layer,hard shell of semi-weathered rock and mudstone. So petroleum m

11、igration and accumulation units is relatively independence above and belowunconformity if structure layers mentioned above existed. Reservoir affection is due to permeable rock, including roof sandstone .Semi-weathered sandstone, semi-weathered carbonate rock, semiweathered igneous rock and semi-wea

12、thered metamorphic. Trapcontrolling affection related to macro unconformity type and its juxtapose to permeability and impermeability rock above and below unconformity. It is easy to develop stratigraphy traps where the permeability and impermeability beds juxtapose in a truncation-overlap unconform

13、ity, where up permeability and down impermeability in parallel-overlap unconformity, and down permeability and up impermeability beds juxtapose in a truncation-parallel. Transporting affection is owing to lateral continuity of permeable rock of unconformity. In a terrestrial rift basin, petroleum mi

14、gration in transverse or vertical short distance in local area, and is not conducive to petroleum long distance along unconformity, because interbedding pattern of mudstone and sandstone is dominated, and its physical property of mudstone improved poorly . Because of the long distance from resource

15、to trap, migration and accumulation procese is very complicated. Accumulation process of Paleogene-Neogene stratigraphic traps can be summarized as following：allochthonous source rock , compound transportation , later period charging, buoyancy and pressure conversion driving for accumulation, and bl

16、ocking by non-permeable layer of unconformity, Trap types and its distribution are controlled by unconformity structure styles. Petroleum distribution and its scale are controlled by generating ability of Source rock. Petroleum accumulation area is decided by positive tectonic units. If carrier syst

17、em existed , oil column of stratigraphic reservoirs is effected by four main factors which including generation expulsion quantity,migrating distance, dip angle and capillary resistance of carrier layer. Based on the analysis of single factor, the prediction model of height of oil columu through mul

18、tifactor regressions was established . Based on the model , the paper defruited favorable areas, which reserves in these areas exceed 1.5 x 1 08t . Research results of the paper combined closely with exploration practice, and according to previous research results，31 exploration wells had been drill

19、ed, which of them 17 wells were successfully from 2006 to 2009. There is accumulation proved reserves Was up to 2362x104t. and predict reserves was to 3684x104t .Keywords：Paleogene; Neogene; unconformity stratigraphie reservoirs; Fomation mechanism; distribution pattern; Jiyang depression1. Preface1

20、.1 Foundationnd and signifacance of the topic1.1.1 Theme origin The theme is from the Sinopcc project：Forming and distribution of Tertiarystratigraphic reservoir of Jiyang depression . Theme number：P06012，deadline：2006-20081.1.2 Foundation and baekground of the theme The tectonic events frequently o

21、ccurred in Jiyang depression in paleogene-NeogeneIt was favour of forming stratigraphic reservoir because of existence of several kinds of unconformity . Based on statistical data , beneficial area reservoired oil is about 9500km2, and the remaining resource is about 16x 108t in stratigraphic reserv

22、oirs of paleogene-Neogene stratasSince 1980s，many overlap and unconformity reservoirs have been founded , explored reserves Was apparently increased with deep exploring. By the end of 2006 , explored resource had been up to 3.7108t which showed a large exploring potential. But , in fact , the resear

23、ch on stratigraphic reservoir is lack or Uttle , especially,Accumulation pattern and forecasting model of oil have not been studied systematically. For example , the successful ratio of exploration well testing which is the lowest in allkinds reservoirs Was only 35.7about stratigraphie reservoir in

24、paleogene-Neogene in Jiyang depression from 2001-2005 . The main loss reason for the overlap andunconformity reservoirs exploration is migration and trap of oil that is separently53.5and 23.9.Hereby , oil migration problem and trap validity are importantaspects for overlap and unconformity reservoir

25、 exploring. In short，it has three aspects as followed： (1)Shallow comprehension about conduction of ability of unconformityResearch on unconformity in present indicated that it is not a simple surface three-dimension body which is important for migration of oil and gasThere has some deep knows about

26、 the basins in west China and the marine basins in China. The systematic theory is lack about structure characteristic which deeply affect accumulating oil and gas. (2)The remain uncertain migration and accumulation process of oil and gas about stratigraphic reservoir remain uncertain . Stratigraphi

27、c reservoir lay in edge of basin . So it is difficult to exactly hold accumulation regular of oil and gas because far distance traps and hydrocarbon resources make a complicated migration process. (3)Forecasting model of stratigraphic reservoir that could be used to guide explore is lack It is neces

28、sity to finely evaluate and explore stratigraphic reservoir along with degree of exploration. Mayor controlling factors remain uncertain in construction offorecasting model of stratigraphic reservoirs.1.1.3 Aim, sense and application value of theme The study resolves the problem of statigraphic rese

29、rvoir formation and distribution of Paleogene-Neogene in Jiyang depression. By analysis of uniformity structure, their affect on statigraphic reservoir formation will be identify; The accumulation model will be established through study on static geologic characteristic of statigraphic reservoir ; F

30、orecast mode of oil extent will be achieved through research on oil extent and to predict oil quality. Research results Can not only be used to effectively guide statigraphic reservoirExploring, to raise drilling Success ratio, provide technical support for increasing oilproduction of the Sinopec, a

31、nd also provide reference to statigraphic reservoir exploring of Bohai Bay area . Research will enormously deepen statigraphic reservoir accumulation regular and further enrich and improve subtle reservoir exploring theory .1.2 Research present at home and abroad1.2.1 Present research and developmen

32、t at home and abroadUnconformity reservoir is one of important exploring object since Levorsen proposed the concept of stratigraphic trap and then published paper onStratigraphic oil field ” in 1 936It turns into stratigraphic reservoir and lithology reservoir based on scholars deepenly research the

33、 Levorsen stratigraphic eservoir . Stratigraphic trap is formed as a result of the updip reservoir directly contigence with unconformity above. According to trap place, accurrence and barrier, stratigraphic oil pools is divided into overlap pool, unconformity barbered pool and ancient buried-hill po

34、ol . Unconformity reservoir research covers three main sections. One is unconformityand its effect on oil accumulating. The second section is developing paaem of stratigraphic trap. The third is mechanism of migrating and accumulating of oil and gas. Present studies mainly focus on the three section

35、s above (1)Unconformity and its effect on oil accumulationUnconformity is geology base and key element to form the overlap and unconformity barriered traps and relevant reservoir . In generally,research on overlap and unconformity barrier reservoirs is first unconformity research target.Oil geologis

36、ts started to understand relationship between inconformity and oil and gas acumination in 1930s. Levorsen published the book of“geology of petroleumin1954. The book entirely introduced definition and significance of unconformity and the relatiooships with oil accumulation .The research and applicati

37、on of unconformity were promoted by stratigraohy and recent oil and gas accumulation theory,especially,the sequence stratigraohy pay a important role in predict of geological discontinuity . Pan zhongxiang23referred to unconformity importance for oil and gas accumulation in 1983. Unconformity is ben

38、efit to find petroleum because it is favour of oil and gas migration and accumulation. From 1990s, the research on unconformity and accumulation effect were also be done in Tarim basin, ordos basin, Bohai bay basin and Jungar basin, a important and innovation result were be achieved . Fuguang4，5，Wu

39、kongyoul6，7and Zhang jianlin8had noted that unconformity is not only a simple surface but also a special geology body, a migration and accumulation passageway of oil and gas. It is represent for tectonic movement, sea or lake suface change，and geologic alteration to earlier rocksThe inhomogeneity of

40、 alteration and later overlap make the a. rchitecture of unconformity. There ale three layers structure in a ideal unconformity: roof rock above unconformity, weathered clay horizon and semi-weathered rockUnconformity formation is related to denudation time，climate, elevation, tectonic movement and

41、lithology. Two layers structure layers were formed as the weathered clay horizon was lack. Liuhua16, Suifenggui17, etc. divided unconformity into four types sand/mud, sand/sand, mud/mud and mud/sand . According to lithologic deploy of unconformity. They refcred that the migrating and accumulating ab

42、ility of unconformity are decided by lithologic deploy of unconformity . Panzhongxiang23, Liuxiaohant11,Zhangkeyin12,Chenzhonghong14,Hedengfa,Aihuaguo19,Wuyajun20,Chenjianping2223, Zhangjiguang2l, John S26etc . had a deepresearch on unconformity and refered that unconformity has an apparent controll

43、ingeffect on oil and gas accumulation. In summery, five main aspects is included: charging reservoir, charging trap,charging migrating, charging accumulating and destroying reservoir. Based on physical modeling of oil migration, Lv xiuzheng Bekele thought the oil migration is followed the rule “migr

44、ation through thin bed”, namely, migration through prevailing passway, otherwise anywhere in a conformity . (2)Development regularity of stratigraphic traps Overlapped and unconformity is premise of overlap and unconformity reservoir Exiting. so, this kind reservoir developed based on overlapped and

45、 unconformity trap formation first. Chensizhong proposed four conditions for developing overlap and unconformity reservoirs in 1982 based on research on the characteristics of overlapped and unconformity reservoirs and its distribution patterns. First is that Multiple overlapped and unconformity res

46、ervoir formed as a result of Multiple unconformityies and overlaps.second is that oil avvumulation area is above and below unconformity nearby hydrocarbon source rock. Third is that Torque subsidence of dustpan depression cause wide rang of overlap and unconformity reservoir. Fourth is that favourab

47、le overlap and unconformity reservoir lies in anti-cycle litbofacies fold play. Tong xiao guang referred four main controlling factors in 1983. First is time, lithology, attitude and weathering degree of pre-Paleogene-Neogene base rocks. Second is structure of faulted depression and movement strengt

48、hThird is overlap distribution of overlap line and feature of overlap lay above unconformity. Fourth is distribution of unconformity surface, permeability of overburden rocks above unconformity. Hujianyi 1lreferred that unconformity is the base of forming overlap and unconformity barrier trap, but n

49、ot all good trap exits bearby unconformity in 1 984 and 1 986. The basic condition of forming overlap and unconformity barrier trap are six elements：three lines and three surfaces. Three lines are lithologic wedging line, layer overlap line and intended zone contour line. Three surface are unconform

50、ity surface, adjacent rock surface of reservoir and fault surface. It exits kinds of trap types when six elementsarraies. People deeply know development regularity of overlap and unconformity trapwith sequence stratigraphy spring up. Zhangshanwen31 refer that multi. type breakcontrol overlap and unc

51、onformity trap, base on researching sequence of Zhungaer basin, Bohaibay basin and Songliao basin in 2003. Lipilong35-39 refer that tectonic and deposit control overlap and unconformity trap in 2003 and 2004. Tectonic movement cause basin up and down, formed large area exceed peel zone in edge of ba

52、sin. It is benefit to form trapTectonic form nosing structures in basin. It is benefit to form traps, Deposit control reservoir and barrier layer forming. Yishiwei42 propose that oil accumulation controlled three surface, lake extensive surface, unconformity surface and fault surface, according to E

53、rlian basin, Jizhong depression overlap andinconformity reservoir characteristic. Overlap and unconformity reservoir distributionare controlled by truncation zone and overlap zone. Enriching is controlled by beneficial accumulating phase belt. (3)Oil and gas migration and accumulation mechanism of s

54、tratigraphic trap Reservoir is resuk of oil and gas migrating and accumulating in long distance, due to stratigraphic trap far from hydracarbon source rock. It is controlled by migrating dynamic, passageway, path, distance and accumulation etc. Lipilong35-39refer that the most effective oil path is

55、fault-sand fault-unconformity and fault-sand-unconformity compound transmit system for overlap and unconfortuity trap in 2003 and 2004Lichunguang44 refer that heavy crude is secondary gas/oil pool through unconformity path migrating and accumulating in unconformity accompany trap, based on researchi

56、ng feavy crude reservoir of Dongying depression in 1999. Zhangjiazhent and Wangyongshi48refer that YLhezhuang reservoir mainly lie in 100m above old burial hill old layer reflect shaft in 2005. Capping formation and barrier formation control the accumulation of the area oil and gas. Better Capping f

57、ormation and barrier formation, better oil accumulation Suifenggui17refers that it is key for stratigraphic trap accumulation thatT-Stransmit system validity and ability consist of oil soures fault，sand and ubconformity in 2005 in Jiyang depression. Layer unconformity style affects the stratigraphy

58、trap forming and oil and gas migrationLvxiuxiang refer that migration in uncomformity is thin bed migration through oil migrating physical analog in 2000. Oil migrates along advantage path, but not unconformity surface. All in one, there are many researches and outcome about trap develop and oil/gas accumulation of land facies basin stratigraphy reservoir home and abroad. But trap forcast is difficult because stratigraphy lie in basin edge and changeable lithofacies.Accumulation regular known less than other type reserv