Asphalt features and gas accumulation mechanism of Sinian reservoirs in the Tongwan Palaeo-uplift, Sichuan Basin

被引：0
作者：
Li, Wei [1 ]
Hu, Guoyi [1 ]
Zhou, Jingao [1 ]
机构：
[1] Research Institute of Petroleum Exploration & Development, PetroChina, Beijing
来源：
Natural Gas Industry | 2015年 / 35卷 / 06期
关键词：
Asphalt; Hydrothermal; Indosinian-Yanshan period; Natural gas accumulation; Palaeo oil reservoir; Palaeo-structure; Reservoirs; Sichuan Basin; Sinian; Tongwan palaeo-uplift;
D O I：
10.3787/j.issn.1000-0976.2015.06.002
中图分类号：
学科分类号：
摘要：
Breakthroughs have been made in natural gas exploration in Sinian reservoirs in the Tongwan Palaeo-uplift, Sichuan Basin, recently. However, there are disputes with regard to the genetic mechanisms of natural gas reservoirs. The development law of asphalts in the Sinian reservoirs may play an extremely important role in the study of the relationships between palaeo oil and gas reservoirs. Accordingly, researches were conducted on the features and development patterns of asphalts in the Sinian reservoirs in this area. The following research results were obtained. (1) Asphalts in the Sinian reservoirs were developed after the important hydrothermal event in the Sichuan Basin, namely the well-known E'mei Fissure in the mid-late Permian Period. (2) Distribution of asphalts is related to palaeo oil reservoirs under the control of palaeo-structures of Indosinian-Yanshan Period, when the palaeo-structures contained high content of asphalts in high positions of the palaeo-uplift. (3) Large-scale oil and gas accumulations in the Sinian reservoirs occurred in the Indosinian-Yanshan Period to generate the Leshan-Ziyang and Gaoshiti-Moxi-Guang'an palaeo oil reservoirs. Cracking of crude oil in the major parts of these palaeo oil reservoirs controlled the development of the present natural gas reservoirs. (4) The development of asphalts in the Sinian reservoirs indicates that hydrocarbons in the Dengying Formation originated from Cambrian source rocks and natural gas accumulated in the Sinian reservoirs are products of late-stage cracking of the Sinian reservoirs. (5) The Sinian palaeo-structures of Indosinian-Yanshan Period in the Sichuan Basin are favorable regions for the development of the Sinian reservoirs, where discoveries and exploration practices will play an important role in the era of Sinian natural gas development in China. ©, 2015, Natural Gas Industry Journal Agency. All right reserved.
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页码：14 / 23
页数：9
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