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纯梁东部地区沙二段沉积体系及成藏规律研究
其他题名Study on sedimentary system and Rules of Hydrocarbon Accumulation in ES2 in Eastern region of Chunliang oil-field
王福勇
2008-04-22
学位授予单位中国科学院地球化学研究所
学位授予地点地球化学研究所
学位名称博士
关键词地震 层序地层 沉积体系 沙二段 砂体 成藏规律 滚动勘探 东营凹陷
摘要纯梁东部地区是胜利油田勘探开发较早的老油区之一,其主力生产层段是下第三系沙三段和沙四段,主力产层现已进入高含水期或特高含水期。该区沙二段曾有零星井产油;近年来,通过利用三维地震进行滚动勘探,发现了多个沙二段的富集高产小断块油藏,部分井初产日油20-50吨,表明沙二段具有较大的滚动勘探潜力。因此,对沙二段进行沉积体系研究,搞清砂体的分布规律,分析其成藏规律和控油因素,对保持该区稳产具有极其重要的现实意义。 利用岩芯和测井等资料,依据高分辨率层序地层学原理,在精细地层划分和对比的基础上,建立了研究区层序地层格架。利用岩芯、测井、地震等资料对研究区沙二段进行沉积体系分析,划分了沉积相、亚相类型及其三维空间分布,明确了砂体展布规律;利用三维地震与钻井等资料,对沙二段构造进行了精细描述,分析了构造特征;结合沉积体系的研究结果,应用含油气系统理论,分析研究了该区油气的成藏机理,在此基础上,分析了沙二段的油气分布规律,预测了有利的滚动勘探目标。 本次研究以新理论为指导,应用地震、地质、测井等多种资料,通过综合分析研究,取得了以下的成果和认识: 1、对研究区130多口井进行了层序地层的细分,并做了8条剖面对比,系统地分析了研究区沙二段的层序地层特征,将沙二段划分为2个三级层序,并细分为10个四级层序。 2、以四级层序为做图单元,做出了10个四级层序的地层等厚图、砂岩等厚图、砂岩百分含量图、砂泥比图,结合单井沉积相分析,做出了各个层序的沉积相分布图。 3、通过目的层沉积演化分析研究表明,沙二段为发育两期不同规模、不同沉积特点的三角洲;其中,沙二下主要发育三角洲前缘亚相和前三角洲亚相,沙二上主要发育三角洲平原亚相和三角洲前缘亚相。 4、研究区内发育一系列近东西走向的断层,地层北低南高,成台阶状,构造线与断层线近于一致,难以形成较大规模的有效圈闭,这是该区沙二段油气不富集的主要原因。 5、沙二段油气藏大都是通过断层由下覆的沙三段油气藏中运移到浅层而形成的,以小断鼻为主要类型,油藏的充满度高,具“小而肥”的特征,有较大的勘探潜力。 6、断层是控制该区沙二段油气成藏的最主要因素,一方面早期开启的断层是沟通下覆油层的通道,另一方面研究区内的主要圈闭是以断层遮挡为主,断层的封闭与否直接决定能否形成有效的圈闭。 通过应用以上研究成果,对东营凹陷纯梁东部地区沙二段油藏勘探潜力进行了整体评价,获得了多个有利的滚动勘探目标,尤其是构造-岩性及岩性油藏是该区进一步滚动勘探的重要方向;目前已提出了可供钻探的勘探目标1个,有利的隐蔽油气藏勘探地区1个。
其他摘要The eastern area of Chunliang is one of the early explored oilfiled in Shengli oil field, with the main productive layers of Es3 and Es4. The main productive layers have entered a period of high water-cut stage or ultrahigh wantercut stage .Only sporadic wells have been perforated at Es2, some of them produce oil;In recent years, many fault block oil reservoirs that are high production have been found by using 3-D seismics to proceed progressive exploration,and some of them produce oil 20-50 ton early , which show Es2 has bigger rolling exploration potential .Therefore, researching Es2 sedimentary system, finding out distribution rule of sandbody of Es2, analyzing the accumulation rules and oil-controlling factors, is of impotance and pratical to the maintenance of oilfield’s production. Based on cores ,well logs and other dates, with the application of high-resolution sequence stratigraphy theory, fine strata division and comparison has been done, and the sequence stratigraphic framework of the region of interest has also been built. With the use of cores, logging, seismic and other data ,Sedimentary system of Es2 in work area has been analyzed , types of sedimentary facies ,sub-facies and three-dimensional spatial distribution have been divided, and the spreading rule of sandbody has also been estabished. With the use of 3-D seismics,drilling and other data, fine description of the structure of Es2 has been made, and structural features have been analyzed;with the application of petroleum system, combining with the research of sedimentary system, oil and gas accumulation mechanism has been analyzed; basing on above work ,hydrocarbon distribution rules of Es2 has been done,and favorable targets for progressive exploration has been provided. With the guidance of new theory, using geology, well logs, seismicand other date, and throught the comprehensive study of the data, the following results and understanding are obtained: 1. Through systematic analysis of Es2 sequence stratigraphy in study area, Es2 has been divided into 2 third-order sequences,further divided into 10 four-order sequences. Sequence stratigraphic subdivision and correlation has been proceeded in more than 130 wells, and 8 comparison of profile has been done. 2. Taking four-order sequence as modules, stratigraphic isopach maps, isopach maps of sandstone, sandstone percentage maps, and sand/mud maps of 10 four-order sequences have been finished; combined with single sedimentary facies analysis, sedimentary facies distribution maps of all the sequences have been done. 3. It is concluded through sedimentation analysis that, there are two periods of delta deposition in Es2, which are different sclae and sedimentary characteristics,; delta front and predelta subfacies have been mainly developed in lower Es2,and upper Es2 has greatly developed delta plain and delta front subfacies. 4.A series of nearly east-west strike faults have been grown in work area,the strata, northern part of which is lower than south,is step-1ike.That the lineament is unanimous with faults,which makes it difficult to fome large scale of structural traps,is the main cause of poor enrichment of oil and gas in Es2. 5.Most of Es2 reservoir is formed by vertical migration of underlying Es3 reservoir to shallow fomation through faults,the main tyeps of which are nose-shaped,the high oil filling up degree and sufficient oil source produced a great exploration potential. 6.Faults are the most important factor controlling Es2 hydrocarbon accumulation,on the one hand,the early opened faults are communication channels to underlying oil layers;on the other hand,the effective traps in workarea are fomed by fault sealing,and the fault sealing capacity directly determines the effectiveness of a trap. Based on above production,the exploration potential of Es2 reservoir in the eastern area of chunliang of dongying depression has been integrally evaluated,many favorable exploration targets have been obtained,especially structural - lithologic composite oil reservoirs are the next important direction of progressive exploration;at present,one exploration target which can be drilled and one favorable hidden reservoir exploration area have been advanced.
页数143
语种中文
文献类型学位论文
条目标识符http://ir.gyig.ac.cn/handle/352002/3262
专题研究生_研究生_学位论文
推荐引用方式
GB/T 7714
王福勇. 纯梁东部地区沙二段沉积体系及成藏规律研究[D]. 地球化学研究所. 中国科学院地球化学研究所,2008.
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