东海盆地西湖凹陷高蜡原油分布及控制因素  

Distribution and controlling factors of high waxy crude oil in Xihu Sag,East China Sea Basin

作　　者：丁飞 刘金水 赵洪 陈晓东 于仲坤 DING Fei;LIU Jinshui;ZHAO Hong;CHEN Xiaodong;YU Zhongkun(Shanghai Branch of CNOOC Ltd., Shanghai 200030, China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200030

出　　处：《成都理工大学学报（自然科学版）》2021年第4期457-465,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：“十三五”国家科技重大专项(2016ZX05027001);中海石油(中国)有限公司科技项目(YXKY-2018-KT-01)。

摘　　要：西湖凹陷不同构造带原油含蜡量差异大,主控因素尚不明确。在原油物性、族组分及色谱特征分析的基础上,通过有机质显微组分鉴定、金管热模拟实验及饱和烃色谱、质谱特征等手段,分析了西湖凹陷高蜡原油分布规律及控制因素。结果显示,高蜡原油主要分布在平湖斜坡带,其中宝云亭-武云亭油气区原油含蜡量最高,孔雀亭油气区原油含蜡量次之,平湖油气田原油含蜡较低;中央反转构造带以及西次凹高蜡原油少有分布。角质体是西湖凹陷高蜡原油主要成油母质,其相对含量及演化程度差控制了不同构造带间高蜡原油分布;油气运聚过程是控制平湖斜坡带不同油气区之间高蜡原油分布差异的主要因素,天然气充注强度、砂体横向连通性及断层发育程度共同决定高蜡原油的最终分布。Based on the characteristics and distribution of crude oil in Xihu Sag,combined with the analysis of maceral compositions of organic matter and thermal simulation experiments,the source of wax and genetic mechanism of crude oil in Xihu Sag are comprehensively analyzed,and the relationship between content of wax in crude oil and hydrocarbon migration and accumulation are emphatically studied through organic maceral identification,gold tube thermal simulation experiment,saturated hydrocarbon chromatography and mass spectrometry.The results show that the high-wax crude oil is mainly distributed in the Pinghu slope zone.Baoyunting-Wuyunting area has the highest wax content of crude oil and the Kongqueting area come the second.The wax content of the crude oil in Pinghu oil and gas field is low and rarely distributed in the central inversion structural belt.Cutinite is the main parent material of high-wax crude oil in Xihu Sag and the relative content and evolution degree of cutinite control the distribution of high-wax crude oil in different structural belts.It is proposed that the process of hydrocarbon migration and accumulation is the main factor controlling the distribution difference of high-waxed crude oil between different oil and gas areas in the Pinghu slope zone.The final distribution of high-waxed crude oil is determined by the intensity of natural gas charging,the horizontal connectivity of sand body and the degree of fault development.

关 键 词：高蜡原油 显微组分 油气运聚 平湖斜坡带 西湖凹陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]