东海盆地西湖凹陷平湖地区油气源对比及油气运移特征分析  

Comparison of Oil-Gas Sources and Analysis of Oil-Gas Migration Characteristics in Pinghu Area of Xihu Sag,the East China Sea Basin

作　　者：王军 曹磊 许怀智 钟荣全 WANG Jun;CAO Lei;XU Huaizhi;ZHONG Rongquan(Shanghai Branch,CNOOC(China)Limited,Shanghai 200335,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology,Xi’an,Shaanxi 710065,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]西安石油大学地球科学与工程学院,陕西西安710065 [3]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2024年第1期1-11,共11页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：“十三五”国家重大专项“东海深层大型气田勘探评价技术”(2016ZX05027-002);中海油“十四五”重大科技项目3课题3“地层岩性油气藏高效识别与精细评价技术”(KJGG2022-0303)。

摘　　要：为了明确东海盆地西湖凹陷平湖地区油气源及油气运移特征,基于对原油和烃源岩生物标志化合物、原油碳同位素、天然气组分、天然气碳同位素,原油物性、含氮化合物等参数的分析,明确了平湖地区的油气来源,揭示了原油和天然气的运移特征。结果表明:西湖凹陷平湖地区A断块花港组原油C_(27)、C_(28)、C_(29)甾烷以V型(C_(27)≈C_(29)>C_(28))分布或者L型(C_(27)>C_(29)>C_(28))分布为主;A断块烃源岩C_(27)、C_(28)、C_(29)甾烷以反L型(C_(27)>C_(28)<C_(29))分布为主,D块(H11井)平湖组中段烃源岩以L型分布为主,与原油的生标较为相似。油源对比结果和含氮化合物相关参数显示,平湖地区花港组原油具有垂向+短距离侧向运移的特征(断砂搭接);气源对比结果、天然气δ^(13)C_(1)和干燥系数显示,平湖地区A断块和B断块平湖组天然气主要来自自身和D断块烃源岩。The characteristics of oil and gas sources and migration in Pinghu area of Xihu Sag,the East China Sea Basin were revealed based on the analysis of parameters such as biomarkers of crude oil and source rocks,carbon isotopes of crude oil,components of natural gas,carbon isotopes of natural gas,and physical properties and nitrogen containing compounds of crude oil.The results show that the distribution of C_(29),C_(29),and C_(29) steranes of the crude in the Huagang Formation of Block A in the Pinghu area of the Xihu Sag is mainly V-shaped(C 27≈C_(29)>C_(29))or L-shaped(C 27>C_(29)>C_(29));The C 27,C_(29),and C_(29) of source rocks in Block A are mainly distributed in reverse L shape(C 27>C_(29)<C_(29)),while those of the source rocks in the middle section of Pinghu Formation of Block D(H11 well)are mainly distributed in L shape,which is similar to the biomarkers of crude oil.The oil-source comparison results and the parameters related to nitrogen compounds show that the crude oil of the Huagang Formation in the Pinghu area has the characteristics of vertical and lateral short-distance migration(fault+sandstone).Gas-source comparison results and theδ^(13) C_(1) and dryness coefficient of the natural gas show that the natural gas in the Pinghu Formation of Block A and Block B in the Pinghu area mainly comes from the source rocks in Block A and B themselves and fault block D.

关 键 词：生物标志物 含氮化合物 油气运移 平湖地区 西湖凹陷 东海盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]