成都理工大学学报（自然科学版）2009，Vol.36Issue(6)：662-668,7.
川中地区震旦系油气成藏过程的相态演化与勘探前景
Phase evolution during hydrocarbon accumulation and exploration prospect for Sinian reservoirs in Central Sichuan Basin, China
摘要
Abstract
This paper analyzes the exploration prospect of Sinian in the centre of Sichuan Basin from hydrocarbon accumulation history. The apatite fission track analysis and Easy Ro (vitrinite reflectance) chemical kinetic model are carried out to compute the thermal history of the Cambrian source rocks and Sinian reservoirs. The hydrocarbon generation history of the Cambrian source rocks indicates that secondary generating hydrocarbon has ever happened obviously. These events lead to multiple phase hydrocarbon fluid charge in the Sinian reservoirs. With the change of temperature and pressure of formation, the phase of hydrocarbon fluid in the Sinian reservoirs has produced a series of changes as follows: oil → condensate oil and wet gas → natural gas due to oil cracking to gas → liquid methane (water soluble gas)→gaseous methane. With regard to the hydrocarbon accumulation, the most important processes are the formation of water-soluble gas resulting from generating abnormal overpressure in the process of oil cracking to gas, and the exsolution of the water soluble gas with the change of temperature due to the structural uplift. In this area, the Cambrian source rocks have a strong hydrocarbon-generating capacity, and the formation and development of the Sinian palaeo-structure match well with the hydrocarbon-generating history. All these evidences indicate that there is a great exploration prospect in Sinian of Central Sichuan Basin.关键词
川中地区/震旦系/水溶气Key words
Sichuan Basin/ Sinian/ water-soluble gas分类
能源科技引用本文复制引用
袁海锋,徐国盛,王国芝,毛敏,梁家驹..川中地区震旦系油气成藏过程的相态演化与勘探前景[J].成都理工大学学报（自然科学版）,2009,36(6):662-668,7.基金项目
国家重点基础研究发展规划"973"项目(2005CB422106) （2005CB422106）
