海洋地质前沿2024，Vol.40Issue(1)：1-10,10.DOI:10.16028/j.1009-2722.2023.094
东海盆地西湖凹陷南部火成岩发育区G构造油气成藏特征
Oil and gas accumulation characteristics of Structure G in the igneous rock area south of Xihu Sag,East China Sea Basin
摘要
Abstract
Structure G is a large compressional inversion anticline located in the igneous rock development area of the Tiantai Slope Zone in the southwest corner of the Xihu Sag.Due to the lack of understanding of the volcan-ic activity and later oil-gas preservation and accumulation evolution conditions in this area,the oil-gas exploration process in the Tiantai Slope Zone is severely restricted.Therefore,we interpreted the seismic sounding data in this area,studied the petrology,chronology,and temporal and spatial distribution characteristics of igneous rocks in Structure G,and reconstructed the interrelationship among volcanic activity,trap formation,and hydrocarbon ac-cumulation.Results show that the igneous rocks developed in Structure G are shallow intrusive rocks,effusive ex-trusive rocks,and channel igneous rocks in the middle Miocene.The development of the igneous rocks fragmen-ted the strata of the Pinghu Formation and Huagang Formation.Due to the existence of early volcanic channels in the core of the Structure G anticline,the traps formed by later extrusion are less effective.From the Longjing Movement(late Miocene,5.3 Ma)to the depositional period of the Santan Formation(Pliocene),a series of nearly EW-trending secondary faults developed at the turning end of the anticline,further destroying the integrity of the trap.We believe that since the anticline wing is not affected by igneous rocks,the structural-lithological traps there should be an important direction for further exploration.关键词
龙井运动/反转背斜/岩浆活动/西湖凹陷/东海盆地Key words
Longjing Movement/inversion anticline/magmatic activity/Xihu Sag/East China Sea Basin分类
海洋科学引用本文复制引用
王军,张晓庆,赵洪,许怀智,钟荣全..东海盆地西湖凹陷南部火成岩发育区G构造油气成藏特征[J].海洋地质前沿,2024,40(1):1-10,10.基金项目
"十三五"国家重大科技专项"东海深层大型气田勘探评价技术"(2016ZX05027-002) （2016ZX05027-002）
中海油"十四五"重大科技项目 3课题 2"潜山油气成藏理论与勘探关键技术"(KJGG2022-0302) （KJGG2022-0302）
