东辛永3断块区断裂特征及形成机制研究

发布时间：2018-06-27 02:47

本文选题：永3断块 + 沙河街组　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：东辛永3断块位于东营凹陷东北部,内部被多级断层切割复杂化,为一中高渗多油层复杂断块,其含油层位为沙河街组。该区主要存在断裂发育特征与断裂演化过程研究不系统,断裂形成机制认识不透彻及断裂对油气的控制作用不明确等问题,严重制约了该断块后续开发。本论文基于地质、地震解释、测井、测试等资料,物理实验与数值模拟相结合,开展了沙河街组断裂形态及组合样式、断层活动性、构造演化分析等研究,阐明了研究区断裂特征及形成机制,揭示了断裂对沙河街组油气分布的影响。取得的成果及认识主要有以下方面:(1)总结出主要断层特征及组合样式。认为东辛永3断块断裂系统分为近EW、NW、近SN向三组;构造样式在剖面上表现为“y”字型、阶梯状、地堑—地垒式组合样式;在平面上表现为雁列状、平行状、放射状和斜交式组合样式。断裂特征和组合样式反映了本区构造是由伸展应力和走滑剪切应力叠加产生。(2)阐明了主要断层的活动特征。主干断层活动具有分段性和分期性特征,次级断层活动,总体倾角一般都大于60°,体现了走滑性质,并且随着演化发展,走向和倾角变化多样。(3)提出了研究区断裂成因机制。受郯庐断裂带右旋剪切作用,东营凹陷区域构造应力影响及塑性泥膏层上拱共同作用,在两期伸展、伸展—走滑和底辟上拱等多种动力机制作用下经历了多期构造演化,并将研究区划分为孔店组—沙四段、沙三段—沙二下亚段、沙二上亚段—沙一段、东营组—明化镇组四个构造演化阶段。(4)构造物理模拟和构造应力场数值模拟正反演相结合证实了永3断块区在古新世—中始新世受到NNE向的伸展作用,在晚始新世—晚渐新世受到NW、NNE双向伸展、右旋剪切及底辟上拱多期共同作用。(5)揭示了沙河街组断裂对油气分布的控制作用。断层级次、活动性、断层组合样式控制着油气藏的分布;高级序断层具有较强的封闭性,能够完全遮挡油气的运移及扩散,低级序断层与高级序断层组合形成羽状断裂组合样式,利于剩余油富集。
[Abstract]:Dongxinyong 3 fault block is located in the northeast of Dongying sag, which is complicated by multistage fault cutting, and is a complex fault block with middle, high permeability and multiple oil layers, and its oil-bearing horizon is Shahejie formation. There are some problems in this area, such as the lack of systematic study on the characteristics of fault development and the process of fault evolution, the lack of thorough understanding of fault formation mechanism and the unclear control of fault on oil and gas, etc., which seriously restrict the subsequent development of the fault block. Based on the data of geology, seismic interpretation, logging, testing, physical experiments and numerical simulation, this paper has carried out the research of Shahejie formation fault morphology and combination style, fault activity, structural evolution analysis, and so on. The characteristics and formation mechanism of faults in the study area are expounded, and the influence of faults on the distribution of oil and gas in Shahejie formation is revealed. The main achievements and understandings are as follows: (1) the main fault features and combination patterns are summarized. It is considered that the fault system of the Dongxinyong 3 fault block is divided into three groups: near EWN NW, near SN direction, and the structural styles are y, ladder, graben and crustal assemblage in the section, and geese and parallel in the plane. Radial and oblique combinations. The fault characteristics and combination patterns reflect that the structure in this area is formed by the superposition of extensional stress and strike-slip shear stress. (2) the active characteristics of the main faults are clarified. The main fault activity is segmented and staged. The secondary fault activity, the total dip angle is generally greater than 60 掳, which reflects the strike-slip property, and with the development of evolution, the variation of strike and dip angle is various. (3) the mechanism of fault genesis in the study area is put forward. Under the action of dextral shear in the Tanlu fault zone, regional tectonic stress in Dongying sag and the interaction of the plastic mud layer arch, the tectonic evolution has undergone many periods under the action of two stages of extension, extension-strike-slip and diapir arch, etc. The study area is divided into three parts: kongdian formation-sha 4 member, sha 3 member-sha 2 lower submember, and sha 2 upper submember-sha 1 member The four tectonic evolution stages of Dongying formation and Minghuazhen formation are as follows: (4) the combination of tectonic physical simulation and numerical simulation of tectonic stress field proves that the Yong3 fault block area was extended in NNE direction in Paleocene and Miocene. During the late Eocene to the late Oligocene, NWN NNE extended in both directions, dextral shear and diapir arch combined. (5) the controlling effect of Shahejie formation fault on oil and gas distribution was revealed. The distribution of oil and gas reservoirs is controlled by fault order, activity and fault combination style, and the high order fault has strong sealing property, which can completely block the migration and diffusion of oil and gas. The combination of low order fault and high order fault forms plume fault assemblage style, which is favorable for remaining oil enrichment.
【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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