特立尼达盆地重力场特征及油气远景  

Gravity characteristics and hydrocarbon prospect of Trinidad Basin

作　　者：邢锦程 袁炳强 张春灌 冯旭亮 段瑞锋 薛健 贾洪杨 李想 XING Jin-Cheng;YUAN Bing-Qiang;ZHANG Chun-Guan;FENG Xu-Liang;DUAN Rui-Feng;XUE Jian;JIA Hong-Yang;LI Xiang(College of Geosciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China;ShaanXi Key Lab of Petroleum Accumulation Geology,Xi'an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《物探与化探》2021年第6期1606-1616,共11页Geophysical and Geochemical Exploration

基　　金：西安石油大学创新基金项目(YCS20112012);中海石油(中国)有限公司项目“委内瑞拉北部近海地区微型重力资料及航磁资料处理与解释”(J2010CLKTFN002)。

摘　　要：特立尼达盆地位于南美洲委内瑞拉北部,加勒比海南缘,该盆地具有良好的油气资源前景。前人对盆地的构造演化、沉积特征等进行了研究,研究范围主要集中在盆地东南部海域。目前尚缺乏对整个盆地构造特征的研究,为了系统研究盆地的断裂分布和基底特征,预测盆地内油气远景区,为盆地进一步勘探工作提供依据,本文利用GETECH公司提供的船测和卫星重力资料,分析研究了该盆地的重力场特征,推断了盆地的断裂构造体系;利用相关分析及Parker法计算了盆地基底深度,并对盆地进行了构造单元划分及油气勘探远景区预测。研究结果表明,特立尼达盆地构造复杂,主要发育NE向和NW向2组断裂,NE向主要断裂控制着盆地的范围和盆地内地层的发育。盆地基底起伏较大,盆地内可以划分为东部次盆、北部次盆、中部隆起带、西部次盆和西北部凸起5个次级构造单元。盆地内东部次盆、北部次盆和西部次盆均为有利油气勘探区。Trinidad Basin,which is located in the northern part of Venezuela in South America and the southern margin of the Caribbean Sea has a good prospect for oil and gas resources.The formers have studied the tectonic evolution,sedimentary characteristics of the basin,the work was mainly focused on the southeastern basin,there is lack of research on the characteristics of the structure of the entire basin.In order to study systematically the distribution of faults and basement characteristics of the basin,predict the prospective areas of hydrocarbon,and provide a basis for further hydrocarbon exploration and development in the basin.This paper uses ship log gravity data and satellite gravity data provided by GETECH to analyze and study the characteristics of the gravity field of the basin,infer the fault structure system of the basin.With the constraints of the three existing seismic profiles,the three gravity profiles with the same position as the above seismic profiles were fitted,the basement depth of the basin is calculated combined with correlation analysis and Parker,the structural units and favorable hydrocarbon exploration areas of the basin are predicted.The results show that the structure of Trinidad basin is complex,there are mainly two groups of faults in NE direction and NW direction,the NE-oriented main faults control the scope of the basin and the development of stratum in the basin.The basement of the basin is undulating and can be divided into six structural units:the eastern subbasin,the northern subbasin,the central uplift belt,the central nappe belt,the western subbasin and the western uplift.The eastern sub-basin,the north sub-basin and the western sub-basin are favorable areas for hydrocarbon exploration.

关 键 词：重力异常 断裂构造 基底特征 油气远景 特立尼达盆地 

分 类 号：P631[天文地球—地质矿产勘探]