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辽河盆地西部凹陷隐蔽油气藏勘探研究
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摘要
清水洼陷是辽河盆地西部凹陷较大的生油洼陷,具有巨大的生油潜力和储油能力。论文综合运用地震资料精细解释、测井资料校正以及地震反演等方法,对清水洼陷的构造特征、沉积特征、储层特征进行综合研究,发现断层近50条、圈闭32个,新增加圈闭面积6.11km2,在此基础上重新评价认识辽河盆地西部凹陷的地质构造和油气储量。取得如下主要认识:
     1、研究区内目的层段断裂构造主要发育于沙三段至东营组沉积的早、中期,以沿断层面滑动的垂直运动为主,走向主要为东西或近东西向,断裂南倾,同生断裂比较发育,在断裂的下降盘易形成同生构造。沙一、二段的构造格局总体上表现为由北向南倾伏的斜坡,南北高差近两千米。以F1断裂为界,可将研究区分成两个构造区划:北部断块区和南部斜坡带。
     2、研究区内新生界沉积较厚,而且各组段储层沉积特征鲜明,成藏条件优越,油源充足,储层发育,盖层稳定,具备畅通的运移通道和有利的生储盖组合。
     3、稀疏脉冲反演方法及地震属性提取方法在三维地震储层中预测中得到了较好的应用,预测结果也得到了钻井的证实。
     4、马圈子南部油田与双台子东部油田紧邻清水生油洼陷,为油气运移的指向区,建议对马圈子南部地区及双台子东部地区进行连片地震解释,可能会发现更多的有利储油构造。
     5、在研究区南部发育有许多类似三角洲前积的沉积体。建议在研究区开展以层序地层学理论为指导,以地震储层预测为手段的隐蔽圈闭研究,可能会开拓油气勘探的新领域。
Qingshui sag is a larger source sag in western depression of Liaohe Basin. There is a enormous potential source area and reservoir capacity. In this article , the features of the structure and the deposition and the reservoir in Qingshui sag were researched by using the methods of interpreting the fine 3-D seismic data and well logging and impedance inversion, and total 50 faults and 32 traps were found in the study area, increased trap area 6.11 km2. On the base, the structure and the reservoir of the western depression in Liaohe Basin had been recognized and known again. The main acknowledge include:
     1、The target layer faults in the study area were developed mainly in the deposition of to Ed at the early or middle time. The tectonic movement was the vertical sliding mainly along the fault plane, whose direction was main east-west or near east-west. The fracture was dumping to south, and compared with the development of other faults. In the decline site of the fracture, it was easy to form an accompanied structure with it. The whole tectonic framework of Es1+2 in the study area performed on a dump slope from north to south, the height difference was near 2000 meters. The work area can be divided into two tectonic zones bounded by F1 faults: the northern was fault block and the southern was slope.
     2、There was a thick Cenozoic sedimentary strata in the study area. Because the depositional environment in different times was very different, it made the reservoir in different group having a very distinctive sedimentary characteristics. At the condition of a certain structure, the developed degree of the reservoir of oil and gas could apparently control the enrichment level of the reservoir. The condition of the reservoir decided the oil-bearing capacity of the reservoir. In study area there had excellent reservoir conditions that the oil resource was plenty, the reservoir was developed, the cap was stability, and having smooth migration pathway and favorable reservoir-seal combination.
     3、In the three-dimensional seismic reservoir, the sparse seismic pulse inversion method and extracting property methods had been used very well, and the results of prediction had been confirmed by drilling.
     4、because of the southern area of the Majuanzi and the eastern area of the Shuangtaizi are near to the Qingshui sag, we ought to make a seismic interpretation in a large area for finding more reservoir of oil and gas.
     5、There are some bodies of deposition liking delta in the southern area. We ought to study the Subtle trap through predicting the reservoir of oil and gas.
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