摘要
综合利用钻井、地震等资料,对南黄海盆地南五凹新生代构造演化和沉积充填特征进行了研究,重点分析了南五凹烃源岩、储盖组合、圈闭类型和运聚条件,结果表明:南五凹新生界具有"坳-断-坳"三层结构;阜宁组半深—深湖相泥岩在南部陡断带、中部反转带和北部缓坡带均有发育,具有面积广、厚度大的特点;阜宁组沉积期经历了广湖咸化过程,咸化湖泊烃源岩不仅规模大,而且生烃活化能低,生烃时间相对早,延长了排烃时间,极大地提升了凹陷的资源潜力;戴南组扇三角洲与滨浅湖相沉积在纵向上形成了3套有利的储盖组合;边界断层及凹陷内部的次级断层长期发育,是有效的油源通道;南部陡断带和中部反转构造带上发育多个规模较大的断背斜或断鼻型圈闭,是有利的油气运移指向区和勘探潜力方向。本文研究结果对南黄海盆地油气勘探具有指导意义。
Based on drilling and seismic data,the Cenozoic structural evolution and sedimentary filling of the Nanwu sag in the South Yellow Sea basin was studied especially for the hydrocarbon geological characteristics of source rocks,reservoir-cap assemblages,trap types and accumulation conditions. Research results show that the Cenozoic strata in the Nanwu sag can be divided into three levels of ＂depression-rift-depression＂. The semi-deep and deep lacustrine mudstone of the Funing Formation were developed on the southern steep faulted belt,the middle inversion belt and the northern gentle slope belt,which is wide and thick. The sedimentation of the Funing Formation experienced lake expansion and salinization. The salinized lacustrine source rock with larger scale and lower activation energy for hydrocarbon generation generated hydrocarbon relatively earlier,prolonged hydrocarbon expulsion time,and greatly enhanced the resource potential of the Nanwu sag. The fan delta and shoreline shallow lacustrine deposits of the Dainan Formation consist of three sets of favorable reservoir-cap assemblages longitudinally. The boundary faults and secondary faults in the sag were developed in a long period,and are the effective hydrocarbon migration pathway. Many large scale faulted anticlines and faulted nose traps,developed on the southern steep faulted belt and the central inversion zone,are favorable hydrocarbon migration and accumulation plays,and are also the most exploration potential prospects. The research results are of guiding significance for hydrocarbon exploration in South Yellow Sea basin.
作者
祁鹏
张功成
王鹏
刘志峰
崔敏
蔡佳
沈娇
王欣
张文昭
QI Peng, ZHANG Gongcheng ,WANG Peng, LIU Zhifeng ,CUI Min ,CAI Jia , SHEN Jiao ,WANG Xin ,ZHANG Wenzhao(CNOOC Research Institute Co. , Ltd. , Beijing 100028, Chin)
出处
《中国海上油气》
CAS
CSCD
北大核心
2018年第4期57-65,共9页
China Offshore Oil and Gas
基金
"十三五"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(编号:2016ZX05024-002)"部分研究成果
关键词
南黄海盆地
南五凹
油气地质特征
成藏条件
广湖咸化
勘探潜力
South Yellow Sea basin
Nanwu sag
hydrocarbon geological characteristics
accumulation con dition
lake expansion and salinization
exploration potential
