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从川中地区震旦系油气成藏过程中相态变化的角度分析勘探前景。运用磷灰石裂变径迹和EasyRo化学动力学模型联合计算了寒武系烃源层、震旦系储层所经历的热史和寒武系烃源岩的生烃史。寒武系烃源岩具有明显的二次生烃的特征,从而导致震旦系储层多期次的油气充注。震旦系储层的烃类流体相态因温度、压力的变化发生了从油→凝析油和湿气→油裂解成因的天然气→液态甲烷(水溶态)→气态甲烷等一系列的相态变化。其中对成藏具有重要意义的是,因温度变化导致油裂解为天然气过程中所形成的异常高压致使水溶气的形成,并因后来构造隆升所引起水溶气的脱溶过程。该区寒武系烃源岩生烃强度大,震旦系古构造的形成和发展与生烃过程配置较好,表明川中地区震旦系具有良好的勘探前景。
Prospect of Prospecting from the Perspective of Phase Change in Sinian Petroleum Accumulation in the Central Sichuan Basin. Apatite fission track and EasyRo chemical kinetic model were used to calculate the thermal history of Cambrian hydrocarbon source rocks and Sinian reservoirs and the hydrocarbon generation history of Cambrian source rocks. Cambrian source rocks have obvious characteristics of secondary hydrocarbon generation, resulting in multi-stage hydrocarbon filling in Sinian reservoirs. The phase state of hydrocarbon fluid in the Sinian reservoirs occurred from oil → condensate and moisture → oil cracking to natural gas → liquid methane (water-soluble) → gaseous methane due to the change of temperature and pressure. Variety. Among them, it is of great significance to hydrocarbon accumulation that the formation of water-soluble gas due to the abnormal high pressure caused by the temperature change in oil cracking into natural gas and the desolvation of water-soluble gas caused by the later uplift of the structure. The Cambrian source rocks in this area have strong hydrocarbon generation intensity, and the formation and development of the Sinian paleotectonics and configuration of hydrocarbon generation processes are good, indicating that the Sinian in Central Sichuan has a good exploration prospect.