乌南次凹油气二次运移及成藏系统  

SECONDARY MIGRATION AND RESERVOIR FORMATION SYSTEM IN WUNAN SUB-SAG

作　　者：文武[1,2] 邓海[2] 孙静[2] 李国福[2] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2009年第3期15-18,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气集团公司重点项目（2008B-0106）资助.

摘　　要：油气二次运移是成藏的关键因素，通过对乌南次凹油气二次运移条件及对已发现油气分布特点的分析，利用油气的物理性质、地化指标、断裂、沉积等总结出该区油气二次运移的主要模式有沿主断层垂直运移、沿不整合面和渗透层侧向运移和复式阶梯式运移等3种模式；乌南次凹油气运移以由西向东运移为主，同时向南、向北运移充注。在分析该区油气二次运移的基础上，建立相应的成藏系统和成藏模式，3种不同的运移方式控制着不同的成藏模式，由于断裂和沉积作用在缓坡带形成多种坡折带，是最有利的大规模油气成藏区带，南一段是构造-岩性油藏的有利成藏区。乌南次凹可划分为自源封闭成藏动力系统、自源半封闭成藏动力系统和自源-他源半封闭成藏动力系统，乌东斜坡带最主要的成藏系统是前两个类型，主要勘探目的层为南屯组一段、南屯组二段和铜钵庙组。Hydrocarbon secondary migration is a key factor of reservoir forming. Based on analysis on secondary migration condition in Wunan Sub-sag and discovered oil and gas distribution features, 3 patterns are determined according to hydrocarbon physical property, geochemical indexes, fracturing and sedimentation, which include vertical migration along main fault, lateral migration along unconformity surface and complex step migration. Hydrocarbon in Wunan Sub-sag migrates mainly from west to east, simultaneously migrates and charges southwards and northwards. On the basis of analysis on secondary migration, corresponding reservoir formation systems and patterns are established. 3 different migration types control different reservoir patterns. Since fracturing and sedimentation form several break belts in gentle slope, it is favorable for formation of large-scale reservoir belt. Nantun I Member is a favorable zone for formation of structural-lithologic reservoirs. Wunan Sub-sag is divided into three systems in- cluding authigenic sealed reservoir forming dynamic system, authigenic half-sealed reservoir forming dynamic system, and authigenic-allochthonous half-sealed reservoir forming dynamic system. Reservoir forming systems in Wudong Slope are the former two types, and the main exploration target layers are Nantun Ⅰ Member, Nantun Ⅱ Mem-ber and Tongbomiao Foramtion.

关 键 词：乌南次凹 乌东斜坡带 油气二次运移 成藏模式 

分 类 号：TE121[石油与天然气工程—油气勘探]