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大安沿江地区黑帝庙油层沉积特征及成藏模式研究
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摘要
利用研究区丰富的岩心、钻井和测井等资料,按照层序地层学和沉积学理论的指导思想,通过对测井曲线上特征识别,摸索和总结出一套适用于河流三角洲体系地层精细划分与对比技术——“逐级标准等时面逼近旋回对比”对比方法,并应用此方法首次将大安沿江地区黑帝庙油层(H2)划分为详细细分了13个沉积时间单元,建立了全区统一、精细的地层格架。为了摸清研究区的物源方向,按照区域沉积学方法和碎屑重矿物分析方法的指导思想,分析得出了西北部英台水系和北部水系东北分支主要影响了研究区,其中大安北油田、大安油田和大庆新站油田主要来自北部物源沉积,南山湾油田主要来自东北物源沉积。在研究精细地层格架、物源后,对大安沿江地区沉积相展布进行了详细分析,提出研究区黑帝庙油层主要发育为三角洲前缘亚相沉积和前三角洲相,总体呈北-南向展布,仅南山湾油田呈现东北-西南展布,其骨架砂体主要为水下分流河道和河口坝砂体,其构成了黑帝庙油层的主要储层。
     在已建立地层格架、物源及研究单砂体内部空间分布规律的基础上,充分利用油气成藏系统等现代地质学新观点的指导思想,通过分析区域大的成藏背景、精细解剖单砂体控油,对现有已发现的油气藏特征及其分布特点进行综合研究,识别出研究油气藏类型主要以岩性、断层-岩性油气藏为主,并对其进行了详细的研究。
     在以上研究成果的指导下,重点预测了松辽盆地南部的大安沿江地区的黑帝庙油层大安鼻状构造轴部及邻凹侧翼、南山湾斜坡为有利成藏区带;并以此为基础,在此区带内基于单砂体成藏规律预测有利圈闭15个、部署井位11口。
This study uses detailed well core, well drilling, and well logging etc data in the studyarea and taking sequence stratigraphy and theory of sedimentology as guidance, with theidentification of logging curve feature, method of stratigraphic fine division and correlation ispresented which is fit to meandering river delta. It is a method that correlation of base levelcycles interfaces are come near under the control of gradual marker chronohorizon. By themethod, Heidimiao oil layer of Da’an area is divided into thirteen sedimentary time unitestablished the uniform and fine stratigraphic framework. Within the regional sedimeniologytheories and detrital heavy-mineral analysis of the basin to find out the sedimentary sourcearea in the study area. The study area is presented which is influenced by the northwestYingtai water system and the northeast branching river system of north water system, andsedimentary source from north water system mainly deposition in Daanbei oilfield, Da’anoilfield and Xin-zhan oilfield while northeast source in Nanshanwan oilfield. The finesequence stratigraphic framework and source of sediments analyzed, the delta frontsub-facies and prodelta sub-facies of Heidimiao oil layer is presented which overall isnorth-south trending,only Nanshanwan oil field showing the northeast-southwest spread. It isrealized that underwater channel and debouch bar sandbodies are sand body framework, theyare mainly reservoir sandbodies of Heidimiao oil layer.
     Based on established stratigraphic framework、 sources of sediments and spatialdistribution of single sandbody, taking full use of petroleum accumulation system and othernew ideas of modern oil and gas geology, and applying the technology of comprehensiveanalysis of accumulation region, a single sand body oil control modem analysis. Through theanalysis of discovered reservoir types and distribution system, mainly identifying lithologic,fault-lithologic reservoirs types, and analysis them in detail.
     Based on all the conclusions above, it is predicted that favorable hydrocarbonaccumulation zones are the axis of Da’an nose structure and adjacent concave flank and theslope of Nanshanwan, and based on this the author points out fifteen favorable traps andmakes recommendation that ten wells should be located.
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