川西坳陷东坡沙溪庙组成藏过程研究

发布时间：2018-01-05 19:21

本文关键词：川西坳陷东坡沙溪庙组成藏过程研究　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：川西坳陷是位于四川盆地中西部的前陆盆地,川西坳陷东坡涉及北东东向孝泉-新场-丰谷构造带、南北向知新场—龙宝梁构造带和中江斜坡带三个构造区带,中侏罗统沙溪庙组为主要含油气层系之一。川西坳陷东坡地区天然气资源丰富,是油气勘探的热点地区。在充分吸收前人相关研究成果的基础上,以天然气成藏机理和成藏动力学原理为指导,应用试气、油气显示、录井、测井解释等资料,厘清了川西坳陷东坡沙溪庙组的气水分布特征;应用油气动态成藏恢复等技术和方法,结合输导体系特征和运移模拟结果,通过成藏动力分析及典型气藏解剖,揭示川西坳陷东坡不同构造位置、不同断-砂配置条件下油气运聚过程及成藏演化的差异性,开展气藏成藏主控因素及富集规律研究,指出川西坳陷东坡沙溪庙组有利目标区,为沙溪庙组油气勘探部署提供理论依据和技术支撑。根据烃源岩生烃演化史和流体包裹体分析结果,沙溪庙组储层主要有3个成藏期,大致在141~68 Ma:第一期成藏要在141~128Ma(J3~K1),第二期成藏主要发生在105~88Ma(K1~K2),第三期成藏主要在83~68Ma(K2)。对研究区典型气藏进行解剖,高庙子地区和中江-回龙地区主要以气层、含气层为主,同时含有一定量的气水同层。分析地层水分布特征可知沙溪庙组天然气和地层水由烃源断层附近向构造远端逐步侵入的过程,存在来自深部须家河组地层水沿断层通道向上运移渗入,从而驱逐地层中原生水的成藏过程。在剥蚀恢复和构造演化分析的基础上,分析天然气从成藏关键时刻到喜山期调整的动态成藏过程,建立川西坳陷东坡沙溪庙组气藏动态成藏演化模式3个,分别为:(1)高庙子地区成藏模式:气体在异常高压下沿断层向上运移,遇到断砂匹配好的优质储层则向构造高点侧向运移;喜山运动使气体再次调整运移方向。(2)中江下沙溪庙成藏模式:中江古构造存在平缓微构造,气体在异常高压的作用下沿烃源断层向断层上盘储集物性好的砂体充注,喜山运动导致断层与储层上倾方向相接,储层内部非均质性严重,导致砂体封闭,形成香肠式结构。(3)中江上沙溪庙成藏模式:天然气在异常高压的作用下沿断层向上运移,遇到断砂匹配好的优质储层则向构造高点进行侧向运移,但由于断层规模较大,与之相邻砂体形成含水带;喜山运动使气体再次调整运移方向。沙溪庙组天然气成藏4个控制因素分别为“断砂控运,储层控藏,构造控向,演化控调”。主要选取7种条件制定研究区天然气富集区评价体系,依据评价体系,研究区共有Ⅰ、Ⅱ、Ⅲ类天然气富集区。沙一段与沙二段有利区分布相似,都是靠近烃源断层地区主要发育Ⅰ、Ⅱ类有利区,远源地区主要发育Ⅲ类有利区。沙三段主要发育Ⅰ、Ⅱ类有利区。高庙JS24-2北部河道;中江JS31-2(3)号河道;中江JS33-3(4)号河道为本次研究的三条有利目标河道。
[Abstract]:The West Sichuan depression is a foreland basin is located in the western Sichuan basin, east to nee Xiaoquan Xinchang Fenggu tectonic belt in Western Sichuan depression, North and south to know with three tectonic Xinchang - Long Baoliang tectonic belt and Zhongjiang slope belt, Middle Jurassic Shaxi Temple group is one of the main oil-bearing series. Natural West Sichuan depression rich gas resources in Dongpo area, is a hot area for oil and gas exploration. Based on absorbing the previous related research results, using natural gas accumulation mechanism and accumulation dynamics principle, application of gas, oil and gas, logging, well logging interpretation data, to clarify the West Sichuan Depression gas water distribution characteristics of Dongpo Shaxi Temple group; application of oil and gas accumulation dynamic recovery technology and method, combined with the characteristics of conducting system and transport simulation results, through the accumulation of power analysis and typical gas reservoir, reveals the West Sichuan Depression Dongpo different tectonic positions, different Sand fault configuration under the condition of hydrocarbon migration and accumulation in different evolution, development and enrichment of the gas accumulation controlling factors, pointed out that the Shaxi Dongpo Temple group favorable target area of Western Sichuan depression, provide theoretical basis and technical support for the deployment of the Shaxi Temple group of oil and gas exploration. According to the history and fluid inclusion the analysis results of hydrocarbon generation evolution, the main Shaxi Temple of the reservoir has 3 accumulation periods roughly in the 141~68 Ma: the first period accumulation in 141~128Ma (J3~K1), the second accumulation mainly occurred in 105~88Ma (K1~K2), the third accumulation mainly in 83~68Ma (K2). The anatomy of typical gas the study area reservoir, Gaomiaozi area and Zhongjiang area mainly in Huilong reservoir, gas bearing layer, but also contains a certain quantity of gas and water in the same layer. The analysis process of formation water distribution characteristics of the Shaxi Temple group of natural gas and formation water from a nearby source fault tectonic intrusive distal gradually, From the deep Xujiahe formation water infiltration upward migration along the fault channel, thus forming the Central Plains Water expulsion formation process. On the basis of erosion restoration and tectonic evolution analysis, analysis of natural gas from the reservoir to the critical moment dynamic Himalaya stage accumulation process, the construction of West Depression Dongpo Lichuan Shaxi Temple group gas reservoir reservoir dynamic evolution model 3, respectively: (1) accumulation model of Gaomiaozi area: gas under abnormal high pressure in the upward migration along faults, reservoir sand, meet quality is good to the structural high lateral migration; the Himalayan movement made the gas migration direction adjust again. (2) Shaxi Zhongjiang Temple Reservoir Model: Nakae Ko structure are flat micro structure, gas to the hanging wall of the fault reservoir well sand filling along the source fault in abnormal pressure under the action of the Himalayan movement caused by fault and reservoir updip direction is non reservoir The heterogeneity is serious, resulting in the formation of sand body sealing, sausage type structure. (3) reservoir model of Shaxi temple into Zhongjiang: natural gas in abnormal pressure under the action of the upward migration along faults, reservoir sand quality encountered a good match to the structural highs of lateral migration, but due to the fault of large-scale formation, including the water and the adjacent sand body; the Himalayan movement made the adjustment again. Gas migration direction of natural gas accumulation in Shaxi Temple group 4 control factors were "broken sand control, reservoir reservoir control, structure control, evolution control. Mainly selected 7 kinds of conditions to develop the study area of natural gas reserves evaluation system on the basis of the evaluation system, the study area, a total of I, II, III type of natural gas enrichment area. Es1 and Sha two section in favorable areas are similar, are close to the source fault area mainly developed favorable area I, class II, class III far source area mainly developed in this area. The main development of Sha three section II. Favorable area. North of JS24-2 River Zhongjiang Gaomiao; JS31-2 (3), Zhongjiang River; JS33-3 (4) No. three favorable target of river river in this study.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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