阜新盆地辽阜地2井沙海组烃源岩地球化学特征及油源对比  

Geochemical characteristics and oil-source correlation of Shahai Formation hydrocarbon source rocks in Well Liaofudi 2,Fuxin Basin,China

作　　者：赵洪伟[1] 张德军[1] 陈树旺[1] 肖飞 ZHAO Hongwei;ZHANG Dejun;CHEN Shuwang;XIAO Fei(Shenyang Center of Geological Survey,China Geological Survey,Shenyang 110034,China)

机构地区：[1]中国地质调查局沈阳地质调查中心,沈阳110034

出　　处：《成都理工大学学报（自然科学版）》2021年第5期582-590,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41790451);国家重点研发计划项目(2019YFC0605404);中国地质调查局地质调查项目(DD20190097)。

摘　　要：研究辽宁阜新盆地下白垩统沙海组烃源岩地球化学特征,厘定油源性质。通过对阜新盆地辽阜地2井沙海组烃源岩、原油样品分析,开展烃源岩地球化学特征和油源对比研究分析。结果表明:沙海组下段泥岩厚度较大,暗色泥岩有机碳质量分数为0.75%~6.04%,平均值为3.49%,属于好烃源岩;有机质类型以Ⅱ型为主,R o介于0.69%~0.94%,处于低熟-成熟演化阶段;烃源岩母质含有低等水生生物及高等植物,沉积物主要形成于弱还原-弱氧化的淡水—微咸水的沉积环境中;原油为低含蜡、中质原油,生物标志化合物指标显示沙海组原油与沙海组下段烃源岩具有较好的亲缘关系。沙海组原油主要来自于沙海组烃源岩。Based on the analysis of the Shahai Formation source rocks and crude oil samples from Well Liaofudi 2,Liaoning Province,Fuxin Basin,the geochemical characteristics of source rocks and oil-source correlation are studied and analyzed in order to determine the oil source properties.The results show that the mudstone in the lower member of Shahai Formation is thick,and the organic carbon content of dark mudstone ranges from 0.75%to 6.04%,with an average value of 3.49%,characteristic of good source rock.The organic matter type is mainly typeⅡ,and the R o is between 0.69%and 0.94%,in the stage of low mature to mature.The parent material of the source rock contains lower aquatic organisms and higher plants,and the sediments are mainly formed in the sedimentary environment of weakly reduction-weakly oxidized fresh water and brackish water.The crude oil is of low wax content and medium quality,and the biomarker index shows that the crude oil from Shahai Formation has a good relationship with the source rocks of the lower member of Shahai Formation.It is concluded that the crude oil of Shahai Formation mainly comes from the source rock of Shahai Formation.

关 键 词：阜新盆地 沙海组 烃源岩 油源对比 辽阜地2井 

分 类 号：TE122.11[石油与天然气工程—油气勘探]