北美页岩气勘探经验对建立中国南方海相 页岩气选区评价体系的启示

近年来,非常规天然气受到各个国家和石油公司的高度重视,页岩气已成为全球非常规天然气勘探开发的热点。中国南方海相页岩形成时代老、热演化程度高、保存条件差、地下构造及地表条件较差,目前缺乏针对中国南方海相页岩气特点的选区评价方法和标准。为此,从中国南方海相页岩气成藏的区域地质背景入手,总结分析北美页岩气成功的勘探经验,类比分析中美页岩气成藏条件差异性,通过页岩气成藏关键控制因素剖析,探索性地提出了中国南方页岩气有利目标的评价思路和技术方法,认为中国南方页岩气选区评价体系和标准应以保存条件为核心、地质评价与经济评价兼顾。按照评价体系选区部署的彭页HF-1井产气量达2.5×104m3/d,实现了中国石化南方页岩气勘探战略的突破。

Marine shale gas evaluation system of regional selection in South China: enlightenment from North American exploration experience

In recent years, shale gas has become a hot field of global unconventional natural gas and has attracted attentions of many countries and oil companies. However, there are no evaluation methods and criterions of regional selection for marine shale gas in South China. Based on geological background and controlling factors of shale gas accumulation, the paper discussed the ideas and methods of shale gas favorable targets evaluation in the southern China through analogical study of the shale gas accumulation conditions between South China and America. Since the shale age is old and has high thermal evolution degree, the preservation condition is poor and the structure condition and surface condition is complex in South China. Evaluation systems and criterions of regional selection of marine shale gas in South China should take the preservation conditions as the core while considering the geological evaluation and economic evaluation at the same time. By using the evaluation methods to guide the exploration, well PengyeHF-1 was drilled with a strategic breakthrough in SINOPEC marine shale gas exploration.