Relationship between Strong Uplifting and Denudation during the Himalayan Epoch and Hydrocarbon Accumulation Effects of Large Gas Fields in the Central-Western Petroliferous Basins of China
详细信息
- 责任者：Li Wei (Petroleum Exploration and Development Research Institute ; PetroChina ; Beijing 100083 ; China) ; Zhu Zhipeng
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(8)
- 关键词：剥蚀作用 ; denudation ; 油气藏形成 ; reservoir formation ; 中国 ; China
- 页码：p.48-55
- 图表：3 illus., 3 tables, 46 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
The relation between gas accumulation effects and strong uplifting is always a hot topic in the academic circle of petroleum geology.However,no systematic study has been carried out on the relationship between strong uplifting and denudation during the Himalayan epoch and hydrocarbon accumulation effects of large gas fields in the central-western petroliferous basins of China.Based on the analysis of the strong uplifting and denudation during the Himalayan epoch at different zones of different basins in central-western China and their correlations with hydrocarbon accumulation effects of large gas fields,it is believed that the strong uplifting and denudation are critical to large-scale gas accumulation and can cause relatively large differences in hydrocarbon accumulation effects due to different geological conditions.They mainly include the following three aspects.(1) In the areas with well-developed salt layers,compressional thrusting and rapid uplifting and denudation can generate highly efficient fluid suction effects;(2) In areas with large scale reservoirs,continuous uplifting and denudation can cause large scale depressurization and ex-solution effects of water-soluble gas;(3) In the areas with high shale content and high thermal maturity,continuous uplifting and denudation can result in depressurization and water adsorption.A huge difference in geological conditions of hydrocarbon accumulation is the major cause of the above hydrocarbon accumulation effects.The highly efficient fluid suction effects mainly occur in thrust belts with high quality gypsolith and salt seals;the large scale exsolution effects of the water-soluble gas mainly occur in large reservoirs without full charging of gas;the large-scale water adsorption effects of mudrocks mainly occur in the formations with high thermal maturity,high shale content and abundant gas sources.