四川盆地碳酸盐岩源岩气地质特征与勘探前景

充分利用露头、岩芯、岩屑等原始样品，通过薄片观察、物性分析、扫描电镜、X射线衍射及同位素分析等实验方法，结合测井资料、地震剖面解释等进行研究，从碳酸盐岩源岩气地球化学评价参数和指标厘定入手，以南川区带高产稳产气藏为实例，深入解剖四川盆地茅口组一段碳酸盐岩源岩的岩矿、物性、电性、含气性及生烃潜力，探讨了表生沉积环境、早期成岩作用等因素对碳酸盐岩源岩气储层的影响，尤其是富镁黏土矿物黑滑石在碳酸盐岩中有机质富集、碳酸盐岩气成生和聚集的积极作用，进一步明确气藏高产稳产的主控因素，落实“甜点段”的特征和分布，指明了该领域勘探开发的前景。

Geological Characteristics and Exploration Prospect of Carbonate Source Rock Gas in Sichuan Basin

By means of thin section observation,petrophysical property analysis,scanning electron microscope,X-ray diffraction,isotope analysis and other laboratory test methods,combined with logging data analysis,seismic profile interpretation and other research,starting from the determination of geochemical evaluation parameters and indicators of carbonate source rock gas,taking stable high production gas reservoir in Nanchuan area as an example,this paper makes full use of the original samples such as outcrop,drilling core,cuttings,dissects the characteristics of source rock,petrophysical property,petroelectrical property,gas bearing property and hydrocarbon generation potential of carbonate rocks in the first member of Maokou Formation in Sichuan Basin,and discusses the positive role of supergene sedimentary environment,early diagenesis,especially the evolution series of magnesium rich clay minerals on the enrichment of organic matter,generation and accumulation of carbonate gas in carbonate rocks,so as to clarify the main control factors of stable high production of gas reservoirs and implement the characteristics and distribution of“sweet spot”,and indicate the prospect of exploration and development in this field.