【摘要】 与页岩气生产大国——美国相比,中国页岩气勘探开发除了起步较晚,更有地质条件特殊性决定的页岩气地质特殊性。根据页岩发育环境、页岩类型、演化历史和演化特点等的研究,系统总结了中国海相、陆相页岩油气的地质特殊性。海相页岩具有"一老二杂三高"的特点,时代老、层系多,多期复杂构造运动、破坏强度大,热演化史复杂、成熟度高;陆相页岩具有"一新一深二低"的特点,时代新,埋藏深、成熟低、脆性矿物含量低等,油气兼产。要实现页岩气勘探的突破和储产量的快速增长,应立足中国盆地特殊的地质特征来分析研究页岩气成藏机理、条件和有利分布区域,建立适合中国页岩气地质特殊性的综合评价方法和技术体系,同时加强地震技术、钻井技术、压裂技术、测井技术等攻关。更多还原

【Abstract】 Compared to the high production of U.S.shale gas,shale gas development is in its infancy in China,one important reason is its peculiar geological characteristics.Based on the analysis of the sedimentary environment,shale types,and evolution history& characteristics,this paper summarized the geological peculiarities of marine and continental oil and gas shales in China.The marine gas shales are featured by old age,multiple bed layers,complex multi-period tectonic movement,complicated thermal evolution history,high failure strength,high total organic carbon(TOC)contents,and high degree of thermal maturity and evolution.The continental oil and gas shales are featured by new age,great burial depth,low thermal maturity,and low contents of brittle minerals.In order to achieve a breakthrough of shale gas exploration and a rapid growth of shale gas reserves and production,we suggest that(1) the analysis of shale gas pooling mechanism,geological conditions,and the distribution of favorable exploration target zones should be based on the said peculiarities of shale gas in China,(2)a comprehensive evaluation method and a package of techniques should be set up adaptable for such peculiarities,and(3)bottlenecks should be overcome in such technologies as seismic,drilling,frac treatment,and logging,etc.更多还原