琼东南陵水凹陷北坡构造特征及构造演化分析  

Structural Characteristics and Evolution Analysis of the North Slope of Lingshui Depression in Qiongdongnan

作　　者：王旖旎 张百涛[1] 王允洪[1] 金可洁 WANG Yini;ZHANG Baitao;WANG Yunhong;JIN Kejie(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院,上海200120

出　　处：《海洋石油》2024年第3期31-38,共8页Offshore Oil

摘　　要：为了实现陵水凹陷北坡大型气田的勘探突破,利用钻井、三维地震资料,基于盆地构造解析及平衡剖面技术,综合分析构造格局及断裂体系特征,剖析其与油气成藏的关系。研究表明,构造样式以伸展为主、右行走滑为辅,构造演化分为四期:(1)断陷期(始新世-渐新世),断裂全区发育,活动强烈;(2)断拗期(早中新世),伸展作用减弱,断裂数量减少;(3)拗陷缓慢沉降期(中中新世),开始发育“陆架-陆坡-深海平原”构造格局,控凹断裂持续发育;(4)拗陷加速沉降期(上新世-第四纪),扩张作用减弱,南部右行张扭断裂带开始活动。隆凹相间的构造格局及断裂体系控制西部陡坡带生烃强度大,断砂配置好,东部缓坡带烃源薄,断阶输导差异成藏。提出西部F2-2断裂下降盘为下一步有利勘探区带,为陵水凹陷油气勘探奠定良好基础。In order to achieve a breakthrough in the exploration of large gas field on the north slope of Lingshui Depression,based on the basin structure analysis and balanced section technique,this paper comprehensively analyzes the characteristics of tectonic pattern and fault system,and analyzes the relationship between it and hydrocarbon accumulation by using drilling and 3D seismic data.The results show that the tectonic pattern is mainly extensional and supplemented by right strike-slip,and the structural evolution can be divided into four stages:(1)fault depression period(Eocene-Oligocene),the faults are developed in the whole region and active;(2)fault-sag period(Early Miocene),elongation was weakened and the number of faults decreased;(3)the slow subsidence period(Middle Miocene),the tectonic pattern of"shelf,slope and abyssal plain"was developed,and the concave-controlling faults continued to develop;(4)the period of accelerated subsidence of the depression(Pliocene-Quaternary),the spreading effect was weakened,and the southern right-lateral tension-torsion fault zone began to be active.The tectonic pattern with alternating uplift and depression and corrsponding fault system result in high hydrocarbon generation intensity in the western steep slope zone and good matching of fault and sand body,thin hydrocarbon source in the eastern gentle slope zone,and different fault terrace transport types which result to the difference of oil and gas accumulation.It is proposed that the western F2-2 fault downslope is a favorable exploration zone for the next step,which lays a good foundation for oil and gas exploration in Lingshui Depression.

关 键 词：琼东南盆地 陵水凹陷北坡 构造特征 构造演化 

分 类 号：P54[天文地球—构造地质学]