| 渤海海域埕岛低凸起东部南区新生代断裂系统及油气分布的控制作用 |
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| 引用本文： | 谢宗奎,王志伟,明玉坤,王明,张在振,杨彬,马自超,孙士杰,黄元俊.渤海海域埕岛低凸起东部南区新生代断裂系统及油气分布的控制作用[J].地学前缘,2021,28(5):413-420. |
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| 作者姓名： | 谢宗奎 王志伟 明玉坤 王明 张在振 杨彬 马自超 孙士杰 黄元俊 |
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| 作者单位： | 中国石化股份胜利油田分公司海洋采油厂,山东东营257237;中国石化股份胜利油田分公司海洋采油厂,山东东营257237;中国石油大学(华东)石油工程学院,山东青岛266580 |
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| 基金项目： | 胜利油田科技攻关项目“埕岛东斜坡古近系砂体成因及控制因素研究”(YKB0804);“埕北32断阶带东营组油砂体描述方法研究”(YKY1405) |
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| 摘 要： | 埕岛低凸起东部南区新生代受控于伸展与走滑作用,断裂构造复杂,传统认为中深层北东向与近东西向断层属于同期同沉积断层。针对这一观点及引起的问题,利用钻井和地震资料,运用构造地质理论解析断裂系统。研究区主要发育正断层、走滑正断层两种类型,断开层位有基底—东营组、平原组—东营组、平原组—基底三种情况,现今断裂以东营组与馆陶组之间的区域不整合面为时限划分为两期断裂系统。早期断裂主要切开基底—东下段,属于同沉积断层;晚期断裂主要切开平原组—东营组,可断达基底,其发育受早期断裂制约。北东向与近东西向断层分别属于早晚两期断裂系统,对油气分布各起关键性控制作用:先期基底升降引起的伸展作用形成北东向断层,控制洼槽地貌与深水重力流沉积环境,发育了连片的层状砂质碎屑流;后期郯庐断裂右行走滑派生了近东西向雁列断层,断层面既充当储层上倾方向的遮挡条件,又在东西向挤压时封闭性变差而变成油气垂向运移通道,断层及断层作用控制了圈闭分布与油气聚集的有序性,自东向西,圈闭及油水界面依次升高且充满度变小,呈全充满、欠充满、半充满等状态。断裂系统研究将地质体置于一定的构造应力场中,分析断层组合的空间排列和交切关系以及断层的力学机制和位移特征等,探究时空演化对油气分布的控制作用。断裂系统研究方法在构造作用叠合区具有适宜性,对该区及类似地区的勘探开发具有现实意义。
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| 关 键 词： | 埕岛低凸起 叠合构造 断裂系统 构造应力 断层封闭性 油气运移 |
| 收稿时间： | 2020-01-03 |
Cenozoic fault system in the southern East Chengdao low rise of Bohai Sea area and its control on oil and gas distribution |
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| XIE Zongkui,WANG Zhiwei,MING Yukun,WANG Ming,ZHANG Zaizhen,YANG Bin,MA Zichao,SUN Shijie,HUANG Yuanjun.Cenozoic fault system in the southern East Chengdao low rise of Bohai Sea area and its control on oil and gas distribution[J].Earth Science Frontiers,2021,28(5):413-420. |
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| Authors: | XIE Zongkui WANG Zhiwei MING Yukun WANG Ming ZHANG Zaizhen YANG Bin MA Zichao SUN Shijie HUANG Yuanjun |
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| Institution: | 1. Off-shore Oil Production Plant, Shengli Oilfield Branch Company, China Petroleum & Chemical Corp., Dongying 257237, China2. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China |
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| Abstract: | The structural sedimentary evolution in southern East Chengdao low rise was controlled by both extension and strike-slip effects in the Cenozoic. The fault combination in this area is complex. It is generally believed that the NE and EW faults in the middle-deep stratum belong to contemporaneous and syngenetic faults. In response to this view and the questions it raised, the fracture system is analyzed on the basis of structural geological theory using drilling and seismic data. In the study area, the main types of faults in Cenozoic strata are normal faults and strike-slip normal faults, and there are three types of fault cutting through the blocks of basement-Dongying Formation, Pingyuan-Dongying Formation, and Pingyuan Formation-basement. Taking the regional unconformity between the Dongying and Guantao Formations as a time boundary marker, the existing faults are divided into the early and late fault systems. The early faults, belonging to synsedimentary fault, primarily grew from the basement to the lower part of the Dongying Formation; the late faults mainly cut through the block of the Pingyuan-Dongying Formation reaching the basement, and their evolution was restricted by pre-existing faults. The NE and near-EW faults belong to these two fault systems, respectively, which played a key role in hydrocarbon distribution. The extension caused by the differential elevation and subsidence of the basement formed the NE faults in the early stage, which controlled the trough landform and the sedimentary environment of deep-water gravity flow, and the continuous layered sandy debris flow was developed. The right strike-slip movement of the Tanlu fault initiated the formation of the near-EW en echelon normal faults in the later stage. Fault planes provided not only shielding for developing upward dip direction of reservoirs, but also vertical migration channels for oil-gas due to poor sealing during near-EW compression. Faults and faulting controlled the order of trap distribution and hydrocarbon accumulation. In the E-W direction, fault block traps and oil-water interface increased in proper sequence, and the degree of fullness successively decreased as full, under filled and half filled, etc. Fault system research, putting the geological body in a certain tectonic stress field, analyzes the spatial arrangement and intersectional relationship of fault combination as well as the mechanical mechanism and displacement characteristics of fault, and explores the control effect of space-time evolution on oil and gas distribution. Its research method is applicable in the areas of superimposed tectonics, which has practical significance for oil and gas exploration and development in such areas. |
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| Keywords: | Chengdao low rise superposed structure fault system tectonic stress fault sealing oil and gas migration |
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