基于构造因素的小洼陷烃源潜力差异分析——以白云凹陷番禺29洼为例  

Difference Analysis of Hydrocarbon Source Potential in Small Subsags Based on Structural Factors:A Case Study of Panyu 29 Sub-sag in Baiyun Sag

作　　者：刘军 颜晖 柳保军 王福国 陈淑慧 敖威 LIU Jun;YAN Hui;LIU Baojun;WANG Fuguo;CHEN Shuhui;AO Wei(Shenzhen Branch,CNOOC(China)Ltd.,Shenzhen,Guangdong 518054,China;CNOOC Deepwater Development Ltd.,Shenzhen,Guangdong 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054 [2]中海石油深海开发有限公司,广东深圳518054

出　　处：《海洋石油》2025年第1期8-12,共5页Offshore Oil

摘　　要：随着白云凹陷勘探进程的推进,对周边小洼陷的探索成为勘探方向之一。文昌组中深湖相优质烃源岩的发育是小洼陷勘探取得突破的重要因素。基于钻井和三维地震资料,类比已证实的富生烃凹陷,分析了番禺29洼的洼陷结构、沉积充填及中深湖相烃源岩的发育条件。研究认为,番禺29洼为南断北超半地堑,发育文昌组地层;岩浆底辟作用与控洼边界断层共同促使文昌组下段地层发生强烈沉降,形成深水湖盆;文昌期周缘物源供汇比低,欠补偿沉积环境发育,有利于形成高丰度中深湖相烃源岩。该研究成果有助于推动白云凹陷的勘探进程,并为类似洼陷的油气勘探提供借鉴。With the advancement of exploration,the exploration of surrounding small sub-sags has become one of the exploration directions in Baiyun Sag.The development of high-quality source rocks which are deposited in semi-deep lacustrine facies is an important factor in the exploration of small sub-sags in Wenchang Formation.Based on drilling and 3D seismic data,the structure,sedimentary filling and development conditions of semi-deep lacustrine facies source rocks in Panyan 29 sub-sag are analyzed by analogy with other proven hydrocarbon rich sags.The study suggests that the Panyu 29 sub-sag is in half-graben shape which faulted in the south part and overlapped in the north part,the Wenchang Formation strata are developed in the Panyu 29 sub-sag.The magmatic diapirism and the depression-controlling boundary faults jointly promoted the strong subsidence of the lower Wenchang Formation strata and formed a deep-water lake basin.During the Wenchang period,the peripheral material's ratio of source to sink was low,and the under-compensation sedimentary environment is developed,which is conducive to the formation of high-abundance source rocks in semi-deep lacustrine.This study is helpful to promote the exploration process of Baiyun Sag and provides a reference for oil and gas exploration in other similar sub-sags.

关 键 词：番禺29洼 文昌组 烃源岩 控洼断层 供汇比 

分 类 号：P618.13[天文地球—矿床学]