垦东北部地区古近系地质特征及油气成藏条件

发布时间：2018-08-14 17:41

【摘要】：垦东北部位于垦东凸起北部斜坡带的浅海海域,该区已发现了古近系沙河街组、东营组和新近系馆陶组等多个含油层系,是一个复式油气聚集区。垦东北部已上报古近系控制储量331万吨,近期完钻的垦东88、89、893等井均获得高产工业油流,显示出该区巨大的勘探潜力,因此系统研究古近系地质特征及其油气成藏条件对该地区油气勘探实践具有指导意义。本论文从地震及钻井等基本资料入手,运用翔实的地震、测井、岩心、分析化验资料,着重对研究区构造地层发育特征、沉积储层的分布规律和成藏的主控因素制进行了深入的研究,取得了以下成果认识:1、构造演化受控于区域应力场和郯庐断裂带活动的控制和影响,经历了由古近纪的强拉张、弱走滑到新构造运动阶段的弱拉张、强走滑的转变。区内构造高带均为张扭性构造成因,其边界断层在古近纪期间为张扭性活动。单条张扭性断层活动常造成凸起构造。2、区内主要断层均表现为沙四期与沙三期为强活动期,随后呈现为活动性降低的变化趋势,在沙一期普遍出现了活动性略有增强的现象,至东营组断层活动趋于停止。区内新生代构造演化经历了孔店至沙四下期局限断陷阶段、沙四上至沙二期强烈断陷阶段、沙一至东营期弱断陷阶段及新近纪弱伸展拗陷阶段。3、明确了古近系各时期的主要沉积相类型和发育规律,通过单井相分析认为本区沙河街组、东营组主要发育5种沉积相类型,即扇三角洲、碳酸盐岩滩坝、砂质滩坝、滨浅湖、半深湖等。4、垦东地区古近系油藏类型以构造油藏为主,其次地层油藏。油藏纵向分布受地层发育和区域性盖层控制,平面分布受构造背景和地层超剥规律的控制。根据不同构造带成藏规律的差异性,建立了凸起斜坡带“不整合-断层输导型”油气运聚成藏模式。
[Abstract]:The northeast of Kendong is located in the shallow sea area of the northern slope belt of Kendong uplift. Many oil-bearing strata such as Shahejie formation, Dongying formation and Guantao formation of Neogene have been found in this area, which is a compound oil and gas accumulation area. The controlled reserves of the Paleogene system have been reported to be 3.31 million tons in the northeast of the Reclamation. All the wells of Kendong 88Gian 89893, which have been drilled recently, have obtained high-yield industrial oil flow, which shows the great exploration potential in the area. Therefore, the systematic study on the geological characteristics of Paleogene and its oil and gas accumulation conditions is of guiding significance to the practice of oil and gas exploration in this area. Based on the basic data of earthquake and drilling, this paper analyzes the laboratory data by using abundant seismic, logging, core, and so on, and focuses on the characteristics of structural stratigraphic development in the study area. The distribution law of sedimentary reservoir and the system of main controlling factors of reservoir formation have been deeply studied, and the following results have been obtained: 1. The tectonic evolution is controlled by the control and influence of regional stress field and the activity of Tanlu fault zone, and has experienced the strong extension from Paleogene to Paleogene. The transition of weak strike-slip to the stage of neotectonic movement with weak tensioning and strong strike-slip. The tectonic high zone in this area is of tensional tectonic origin and its boundary faults were tensional and torsional during Paleogene. Single tensional-torsional fault activity often results in uplift structure. The main faults in this area are characterized by strong activity in the fourth and third periods of sand, followed by a decreasing trend of activity, and a slight increase in activity in the first stage of sand. To Dongying formation fault activity tends to stop. The Cenozoic tectonic evolution in the area experienced the stage of limited fault subsidence from Kongdian to Sha 4, and the stage of strong fault subsidence from the top of Sha 4 to the second stage of sand. The main sedimentary facies types and development rules of Paleogene in each period of Paleogene are defined in the weak fault depression stage from Sha 1 to Dongying period and weak extensional depression stage in Neogene. Through single well facies analysis, it is considered that five sedimentary facies types are mainly developed in Shahejie formation and Dongying formation in this area. That is, fan delta, carbonate beach dam, sandy beach dam, shallow lake, semi-deep lake, etc. The Paleogene reservoir types in Kendong area are mainly structural reservoir, next stratigraphic reservoir. The vertical distribution of the reservoir is controlled by stratigraphic development and regional caprock, and the plane distribution is controlled by the tectonic background and the law of stratigraphic overstripping. According to the difference of reservoir formation law of different structural zones, the "unconformity and fault transport type" hydrocarbon migration and accumulation model of uplift slope zone is established.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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