乌石凹陷东区构造演化特征及中浅层油气富集规律研究  

Structure Evolution and Middle-Shallow Hydrocarbon Enrichment Patters in the Eastern Wushi Sag

作　　者：胡林 金秋月 杨希冰 胡德胜 卢梅 Hu Lin;Jin Qiuyue;Yang Xibing;Hu Desheng;Lu Mei(CNOOC(China)Zhanjiang Branch,Zhanjiang,Guangdong 524057,China;CNOOC EnerTech-Drilling&Production Company,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中海能源发展股份有限公司工程技术分公司,广东湛江524057

出　　处：《特种油气藏》2020年第5期68-73,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”(2016ZX05024002)、“近海大中型油气田形成条件及勘探技术”(2016ZX05024006)。

摘　　要：针对乌石凹陷东区中浅层断裂复杂,含砂率高,油气成藏特征和富集规律认识不清的问题,对乌石凹陷东区应力场、断裂特征和构造演化进行分析。研究表明:乌石凹陷在古新世—中晚始新世的伸展应力场呈NW—SE向,渐新世顺时针旋转至近SN向,渐新世末期至中新世呈NE—SW向。乌石凹陷东区先后经历了古新世—始新世裂陷阶段、渐新世伸展滑脱和新近系热沉降阶段。对区域钻井、录井、油柱高度等资料进行统计和分析,结果表明,乌石凹陷中浅层流一段和涠洲组在平面上和纵向上成藏呈现明显差异性,油气主要富集于远离“似花状”构造花心部位的构造裙边带,呈现出外围花瓣富集的特征,乌石凹陷中浅层油藏呈现出“一块一藏,牙刷状”的分布特征。该研究成果对乌石凹陷东区中浅层勘探部署具有重要的指导意义。The stress field,fault properties and structural evolution were analyzed to further understanding the complex faults and high sand content of middle-shallow reservoirs and clarify the hydrocarbon accumulation and enrichment patternsin the eastern Wushi Sag.Research indicates that The extending stress field of Wushi Sag in the Paleocene to Middle-Early Eocene showed a NW-SE direction,and rotated clockwise to near SN direction in Oligocene,and changed to NE-SW direction from the late Oligocene to Miocene.The eastern Wushi Sag successively experienced the Paleozoic-Eocene rift,Oligocene strength slippage and Neogene heat deposition stages.Statistic and analysis of regional drilling,mud logging,oil column height and other data indicate that there are great differences in the lateral and longitudinal hydrocarbon accumulation in the middle-shallow Liu-1 Member and Weizhou Formation in Wushi Sag.Hydrocarbon mainly enriched in the skirt zone far away from the central part of“flower”structure,showing peripheral petal enrichment.The middle-shallow reservoirs in Wushi Sag are characterized by block and toothbrush-like distribution.This research could provide certain guidance for the middle-shallow reservoir exploration deployment in the eastern Wushi Sag.

关 键 词：乌石凹陷 构造演化 花状构造 中浅层 油气富集规律 

分 类 号：TE122.2[石油与天然气工程—油气勘探]