| 四川盆地元坝地区二叠系茅口组油气成藏特征及主控因素 |
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| 引用本文： | 姜智利,朱祥.四川盆地元坝地区二叠系茅口组油气成藏特征及主控因素[J].石油实验地质,2022,44(4):639-646. |
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| 作者姓名： | 姜智利 朱祥 |
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| 作者单位： | 中国石化 勘探分公司, 成都 610041 |
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| 基金项目： | 国家自然科学基金企业创新发展联合基金（U19B6003）和中国石化科技部项目（P20059-1）联合资助。 |
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| 摘 要： | 四川盆地元坝地区YB7井二叠系茅口组的突破，揭示了元坝地区茅口组巨大的勘探潜力。随着资料的不断丰富，及时加强其油气规律认识，总结成藏主控因素，可为下步油气勘探部署提供依据。在分析茅口组气藏基本成藏条件及气藏特征的基础上，开展了气源对比、油气充注时间分析等研究，系统总结了油气成藏主控因素。研究区内烃源岩和油气保存条件好，储层为浅滩叠合岩溶缝洞储层，气藏表现为异常高压高温气藏，天然气具有干酪根裂解气和原油裂解气的混合气特征，主要来源于二叠系吴家坪组烃源岩，油气在中侏罗世大量充注，有持续充注的特点。油气成藏主要受储层发育、烃源岩条件及油气保存条件的共同控制。
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| 关 键 词： | 成藏条件 油气来源 充注时间 成藏主控因素 茅口组 二叠系 元坝地区 四川盆地 |
| 收稿时间： | 2021-06-28 |
Hydrocarbon accumulation characteristics and main controlling factors for Permian Maokou Formation in Yuanba area,Sichuan Basin |
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| Affiliation: | SINOPEC Exploration Company, Chengdu, Sichuan, 610041 |
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| Abstract: | A breakthrough has been made in the Permian Maokou Formation by the well of YB 7 in Yuanba area of the Sichuan Basin, which shows a great exploration potential. With continuous enrichment of data, it is necessary to strengthen the understanding of oil and gas laws and to summarize the main controlling factors of hydrocarbon accumulation, by which a basis for oil and gas exploration and deployment may be provided. In this paper, basic accumulation conditions and characteristics of gas pools in the Maokou Formation were studied, gas-source correlation and hydrocarbon charging time analyses were carried out, and some main controlling factors for hydrocarbon accumulation were summarized. The study area has favorable conditions for source rock and hydrocarbon preservation. The reservoir is mainly shoal superimposed karst fractured type. The gas pool is characterized by abnormally high pressure and high temperature. The natural gas is accumulated from both kerogen and crude oil cracking gas, mainly derived from the Wujiaping Formation. The oil and gas are largely filled in the Middle Jurassic, characterized by continuous filling. The hydrocarbon accumulation in the study area is mainly controlled by reservoir development, source rock conditions and hydrocarbon preservation conditions. |
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