少断裂深水油气成藏模式与有利区优选——以圭亚那盆地上白垩统为例  

Deepwater hydrocarbon accumulation model and optimal selection of favorable areas under the condition of few faults:a case study of the Upper Cretaceous in Guyana Basin

作　　者：陶叶 何幼斌[3] 吴东胜[3] 马福康 李奕添 鲍志东[1,2] TAO Ye;HE Youbin;WU Dongsheng;MA Fukang;LI Yitian;BAO Zhidong(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;St-ate Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;School of Earth Sciences,Yangtze University,Wuhan,Hubei 430100,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]长江大学地球科学学院,湖北武汉430100

出　　处：《东北石油大学学报》2024年第5期62-74,I0005,共14页Journal of Northeast Petroleum University

基　　金：国家重点研发计划专项(2017YFC0603104)。

摘　　要：为明确少断裂深水油气运移机理与成藏富集模式,以圭亚那盆地上白垩统为对象,利用地震、测井、钻井及烃源岩测试分析等资料,研究盆地上白垩统石油地质特征,明确研究区成藏模式,划分勘探有利区。结果表明:烃源岩为土伦阶—康尼亚克阶沉积的巨厚黑色页岩,TOC质量分数为4%~7%,有机质类型以Ⅰ、Ⅱ型为主;储层为坎潘阶—马斯特里赫特阶水道、堤岸、朵叶亚相砂岩;主要盖层为古近纪早期沉积的泥岩与物性较差的巨厚粉砂岩。盆地陆坡区发育砂体叠置—断层斜向型运移体系,形成“源—储紧邻、断—砂匹配、水道聚集”的成藏模式;深水区发育砂体叠置—裂缝垂向型运移体系,形成“源—储分离、缝—砂匹配、高点聚集”的成藏模式。盆地中心深水区烃源岩发育与水道发育叠合区为勘探首选目标,北部堤岸发育与烃源岩发育叠合区或未与烃源岩重合的水道发育地区为勘探的第二选择。该结果对相似地质条件的盆地勘探具有指导意义。In order to clarify the hydrocarbon migration mechanism and accumulation mode under the condition of less faults,this paper takes the Upper Cretaceous in the Guyana Basin as an example,and studies the petroleum geological characteristics of the Upper Cretaceous in the Guyana Basin by using seismic data,drilling data and source rock analysis data.We have defined the reservoir-forming model of the study area and divided the favorable exploration areas.The results show that the source rocks of the Upper Cretaceous in the basin are huge thick black shales deposited in the Toulon-Coniacian stage.The TOC range of organic matter is 4%7%,and the organic matter types are mainly typeⅠand typeⅡ.The reservoirs in the study area are Kampan-Maastrichtian channel,embankment and foliar subfacies sandstone.The study area is mainly covered by mudstone and thick siltstone with poor physical properties deposited in the Early Paleogene.The migration system of“sand body superposition and fault oblique transport type”is developed in the continental shelf area of the basin,and the reservoir formation model of“source rock and reservoir close proximity,fault and sand body matching,and channel gathering”is formed.The migration system of“sand body superposition and fracture vertical transport type”is developed in the deep water area,and the reservoir formation mode of“source rock and reservoir separation,fracture and sand body matching and high point gathering”is formed.The overlapped area of source rock development and channel development in the deep water area of the central basin is the first exploration target,and the overlapped area of source rock development and bank development in the north or the channel development area that does not coincide with source rock development is the second exploration target.The results are of guiding significance to the exploration of basins with similar geological conditions.

关 键 词：少断裂 输导体系 成藏模式 深水沉积 有利区优选 圭亚那盆地 上白垩统 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]