海洋地质前沿2024，Vol.40Issue(10)：71-84,14.DOI:10.16028/j.1009-2722.2023.271
白云凹陷天然气成因及混源气比例定量计算
Origination of natural gas and quantitative calculation of mixed source gas ratio in Baiyun Sag
摘要
Abstract
Baiyun Sag in the Pearl River Mouth Basin encountered few exploration wells of the Paleogene source rocks and various types of source rocks,and developed lacustrine,coal measures,and marine source rocks.There have been long-standing controversies among scholars regarding whether the natural gas in this area is crude oil cracking gas or kerogen cracking gas,as well as whether the natural gas originates from the Enping Formation coal bearing source rocks or from the Wenchang Formation lacustrine source rocks.To solve this problem,we planed to take the gas fields in Panyu Low Uplift and the eastern part of Baiyun main depression as examples,se-lected the Wenchang Formation and Enping Formation hydrocarbon source rocks drilled in the shallow water area in the eastern part of the Pearl River River Mouth Basin,as well as the crude oils of different genetic types found in the shallow water area and Baiyun Sag,carried out a simulation experiment and product analysis of natural gas generation under high temperature and pressure in gold tube,established the identification chart of natural gas genesis,implemented the genesis model of natural gas in Baiyun Sag,and quantitatively calculated the proportion of natural gas mixed sources.Results show that the natural gas in Baiyun Sag is a mixed genesis gas with proper-ties between coal type gas and oil type gas,and all of them are kerogen cracking gas,with no contribution from crude oil cracking gas.Through the calculation of natural gas mixing ratio,we believed that the natural gas in the Panyu low uplift gas reservoir on the north slope of the Baiyun main depression and the gas reservoir in the east of the Baiyun main depression is mainly generated from the Wenchang Formation source rock,with a contribution ratio of 68%to 100%.However,the maximum contribution of kerogen cracking gas generated by the Enping Formation source rock to the natural gas in this area is only 32%.关键词
白云凹陷/生烃模拟实验/天然气成因/气源岩Key words
Baiyun Sag/hydrocarbon generation simulation experiment/natural gas origin/gas source rock分类
海洋学引用本文复制引用
王宁..白云凹陷天然气成因及混源气比例定量计算[J].海洋地质前沿,2024,40(10):71-84,14.基金项目
海油发展工程技术公司科研项目"海上不同类型烃源岩显微组分定量表征和分离富集技术可行性研究"(GCJSXMHT-2023) （GCJSXMHT-2023）
