城口地区鲁家坪组页岩储集特征及含气性影响因素

摘要

The paper analyzes the characteristics of geochemistry,petromineralogy,reservoir physical properties and reservoir spaces,gas bearing properties and preservation conditions for the shales of the Lower Cambrian Lujiaping formation in Chengkou area of northeastern Chongqing,and performs correlation analysis of the factors influencing shale gas content with grey correlation theory.The results show that the preservation of the shales in Lujiaping formation is quite good in the study area.The shale reservoir has high organic matter content and maturity and high brittleness,whose kerogen is dominated by Type Ⅰ;the reservoir spaces are dominated by intergranular pores and large pores are developed in the reservoir with large unit absorbing capacity.But the unfavorable factors such as complicated stratigraphic structures and very high maturity of organic matters of the shales of the Lower Cambrian Lujiaping formation in Chengkou area of northeastern Chongqing may result in the difficulties for future development.%对渝东北城口地区下寒武统鲁家坪组页岩的地球化学特征、岩石矿物学特征、储集层物性特征、储集空间特征、含气性和保存条件以及页岩含气性的影响因素进行了分析后认为,研究区鲁家坪组页岩保存条件良好,有机质含量高,成熟度高,干酪根以Ⅰ型为主,页岩脆性高;储集空间以矿物粒间孔隙为主,储集层大孔较发育,单位吸附气量大,但由于渝东北城口地区鲁家坪组地层结构复杂,有机质成熟度过高,这些不利因素可能会加大后期开发的难度.