9 2017年12月
文章编号：10013873(2017)06-070708
新疆石油地质
XINJIANG PETROLEUM GEOLOCY DOI:10.7657/XJPG20170612
Vol.38,No.6 Dee.2017
辽中凹陷走滑断裂带原油来源、运移及分布层系
王军，吴奎，樊建华，王伟，金小燕
（中海石油（中国)有限公司天津分公司，天津300459）
摘要：激海大部分已发现原油储量集中在郑庐走滑断裂带，面不同油田的油气来源和分布层系差异很大，因此走滑断裂带的油气运移研究具有重要意义。通过研究辽中凹陷辽中1号走滑断裂常的发育阶段，以及派生断裂的应力性质及其沟通的烃源岩和储集层，来揭示沿新聚的垂向运移对源油成因类型和分布层系的控制作用。辽中凹陷北注处于走滑断裂发育的早期，走滑断裂并未形成统一的破裂面且不控制圈闭形成，走滑派生断裂仅沟通东营组，发育密度和活动速率小，原油来源于索三投烃源岩并就近在东二疫聚集成藏，油田规模小。辽中凹陷南洼和中洼处于走滑断裂发育的晚期，建滑断裂形成统一的破裂面且控制圈闭形成，走滑派生断裂沟通沙河街组及上覆多套地层，发育密度大，原油主要来源于沙河街组烃源岩，油田规模大。其中南注走滑派生断裂新构造运动以来发生明星活化，沟通新近系储集层，晚期活动速率大，原油主要在新近系成藏；中洼走滑派生断裂新构造运动以来未发生明显活化，仅沟通古近系，原油主要在古近系成藏。
关键词：潜海湾盆地；辽中凹陷；走滑新裂带；原油来源；分布层系；油气运移
中图分类号：TE112.1
文献标识码：A
Origin,Migration and Distribution ofOil inStrike-SlipFault Zone of LiaozhongSag
WANG Jun, WU Kui, FAN Jianhua, WANG Wei, JIN Xiaoyan(Tianjin Branch, CNOOC China Limited, Tianjin 300459, China)
Abstract: Most of the discovered oil reserves in the Bohai Bay basin eoncentrate in Tan-Lu strike-slip fault zone, but the hydrocarbon ori-gin and its distribution vary significantly in different oilfields. Therefore, it is significant to study hydrocarbon migration in the strike-slip fault zone, Based on the research of development stages, stress characters in derived fractures, and source rocks and reservoirs connected by the derived fractures in Liaozhong-1 strikeslip fault zone of Liaozhong sag, the paper reveals the controls of vertical hydrocarbon migra tion along fractures on oil genesis and distribution. It is found that the north part of Liaozhong sag is in the early development stage of the strike-slip fracture which has no unified fracture surface and can't control trap forming, the derived strike-slip fracture only connected with Dongying formation is not very developed and its slip rate is not high, and the uil originates from the source rocks of the third member of Dongying fomation and accumulates in the second member of Dongying formation where the oilfield is relatively small; the south and mid-dle parts of Liaozhong sag are in the late development stage of the strike-slip fracture which has a unified fracture surface and can control trap forming, the derived strike-slip fracture connected with Shahejie formation and the overlying strata is widely distributed with the oil originating from the source rocks of Shahejie formation, and the oilfields are relatively large here, Obvious activation of the derived strike-slip fracture in the south part of Liaozhong sag occured during neotectonic period, the derived fracture connected Neogene reservoirs and was active at the late stage, and oil mainly accumulated in the Neogene strata; there was no obvious activation of the derived strike-slip frac-
ture in the middle part of the sag during neotectonic period, the fracture only connected Paleogene strata where oil mainly accumulated. Keywords: Bohai Bay basin; Liaozhong sag; strike-slip fault zone; oil origin; oil distribution; hydrocarbon migration
渤海海域的地质构造不但受控于地慢热隆起引起的伸展作用，而且还受控于后期由太平洋板块向欧亚板块的斜向挤压引起的走滑作用。斜向挤压作用导致郑庐断裂发生右旋走滑运动"。郑庐断裂在辽东湾段表现为多条北东一南西和北北东一南南西走向的走滑断裂，在走滑断裂两侧密集分布着北东东一南西西走向的走滑派生断裂”。
国内外已经有众多关于断裂作为油气运移通道
收稿日期：2017-01-04
修订日期：2017-09-26
的报道。文献[3]和文献[4]从定性的角度,研究了油气沿走滑派生断裂的垂向运移；文献[5]通过对渤海多个含油气构造的研究，认为油气的运移能力与断裂活动速率呈正相关；文献[6]发现，渤海湾盆地岐口凹陷断裂连通性与断裂倾角、断裂两盘地层砂岩含量、断裂走向和泥岩流体压力有关；文献[7]通过对野外断裂的观察，将断裂带划分为断层泥、破碎带和原岩 3个带，并认为破碎带是主要的渗透性单元和油气运
基金项日：国家科技重大专项（2011ZX05023-001-004）
作者简介：王军（1984-），男，山东高密人，硕士，T.程师，油气成藏，（(Tel)15222393640(Email)varran@163.com 万方数据