文章检索
首页» 过刊浏览» 2022» Vol.7» Issue(2) 155-173     DOI : 10.3969/j.issn.2096-1693.2022.02.014
最新目录| | 过刊浏览| 高级检索
涠西南凹陷A洼及周缘含油构造油藏地球化学性质及成藏特征
满勇,魏琳,邓勇,李文龙,胡德胜,马潇潇,尹嘉
1 中海石油(中国)有限公司海南分公司,海口 570311 2 中国地质大学(北京)能源学院,北京 100083
Oil geochemical and accumulation characterization in the A sag and surrounding oil-bearing structures of the Weixinan depression, Beibuwan Basin
MAN Yong, WEI Lin, DENG Yong, LI Wenlong, HU Desheng, MA Xiaoxiao, YIN Jia
1 Hainan Branch of CNOOC (China) Co. Ltd., Haikou 570311, China 2 School of Energy Resources, China University of Geosciences, Beijing 100083, China

全文:   HTML (1 KB) 
文章导读  
摘要  通过对北部湾盆地涠西南凹陷A洼及其周缘区域不同井典型原油样品 的地球化学特征分析,将原油进行详细分类和油源对比。结合成藏期 次和输导体系综合分析,确立I和II类原油分别为上源岩第一期和第 二期充注,通过砂体垂向运移至烃源岩上覆砂体,或通过断裂和砂体 近距离运移至A洼周缘浅层圈闭成藏。III类原油为下源岩晚期充注, 通过构造脊和层间断层远距离侧向运移后聚集。该研究成果对北部湾 盆地涠西南凹陷A洼的油气勘探突破具有一定的指导意义。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
关键词 : 涠西南凹陷;油藏地球化学;生物标志化合物;油源对比;运移成藏;供烃组合
Abstract

Based on geochemical characteristics analysis of crude oil samples from different typical wells in the Weixinan sag A and its surrounding areas in the Beibuwan Basin, the crude oils in this area can be divided into three types (Ⅰ, II, and III). The first type of crude oil (Ⅰ) mainly distributed in the shallow reservoirs has relatively heavier oil density, relatively lighter isotopic value, relatively lower abundance of 4-methyl sterane and lower thermal maturity. The third type of crude oil (III) mainly distributed in the deep reservoirs has relatively lower oil density, relatively heavier carbon isotopic value, relatively higher abundance of 4-methyl sterane and the highest thermal maturity. The overall geochemical characteristics of second type of crude oils (II) mainly distributed in the shallow reservoirs are in between. Most of the crude oil of the Weixinan sag A belong to class II and class III. The comparison of geochemical characteristics of source rocks samples shows that there are three sets of source rocks developing in the Weixinan Sag. The upper part source rocks that deposited in an oxidizing environment are dominated by algal input with certain contribution from terrigenous higher plants. The sedimentary environment of the middle part source rocks was more oxidized, and higher plants contributed more to its source materials. The lower part source rocks were formed in a weak reducing-oxidizing environment with large amounts of algal inputs. Oil-source correlation results show that type Ⅰ and type II oils are mainly derived from the upper part source rocks, and type III oils are chiefly derived from the lower part source rocks. Considering the comprehensive analysis of generation stages, accumulation stages, and migration pathways, this study concludes that type Ⅰ oil, which mainly derived from the first hydrocarbon charging stage of the upper part source rocks, is accumulated in the overlying reservoir by migrating upward through sand bodies. Type II oil came from the second hydrocarbon charging stage from the upper part source rocks and accumulated in traps in shallow reservoirs on the periphery of the A Sag. Type III oil was generated from the inner center of sag A and migrated along structural crests through longer migration pathways, and finally accumulated into oil reservoirs when being stopped by big faults and faults between formations. The results of this study not only are helpful to further understand the hydrocarbon accumulation and distribution, but is also significant towards the further breakthrough of petroleum exploration in sag A.

Key words: Weixinan depression; oil geochemical characterization; biomarkers; oil-source correlation; migration and accumulation characteristics; hydrocarbon supply combination
收稿日期: 2022-06-29     
PACS:    
基金资助:中国地质大学( 北京) 基本科研业务费(35832019035)、中海油南海西部油田上产 2000 万方关键技术研究“南海西部在生产油气田提高采 收率技术研究”(CNOOC-KJ 135 ZDXM 38 ZJ) 资助
通讯作者: linwei@cugb.edu.cn
引用本文:   
满勇, 魏琳, 邓勇, 李文龙, 胡德胜, 马潇潇, 尹嘉. 涠西南凹陷A洼及周缘含油构造油藏地球化学性质及成藏特征. 石油科学通 报, 2022, 02: 155-173 MAN Yong, WEI Lin, DENG Yong, LI Wenlong, HU Desheng, MA Xiaoxiao, YIN Jia. Oil geochemical and accumulation characterization in the A sag and surrounding oil-bearing structures of the Weixinan depression, Beibuwan Basin. Petroleum Science Bulletin, 2022, 02: 155-173.
链接本文:  
版权所有 2016 《石油科学通报》杂志社