摘要
自震旦纪到志留纪的长达３９０Ｍａ时间里，加里东古隆起一隆两拗整体存在，隆起南翼拗陷年均沉速快于加里东古隆起约４５．６３％，快于隆起北翼拗陷约２３．３％，说明这是个继承性的古隆起。陡翼压力大，阴力强，断层、袭缝发育，导致溶蚀孔洞连通和发育，在古隆起上寻找大中型油气藏实际上就是着力寻找高陡地段，这是由古隆起成藏条件所决定的；而沉积与成岩环境是决定储层孔隙度和渗透率的内在决定因素，因此，孔洞发育，连通性较好，工业气井成功率高的是潮间沉积大气成岩环境；潮下沉积海水成岩的碳酸盐岩，只要有裂缝勾通孔隙也可运聚成藏，当然，裂缝的发育要求一定的褶皱强度和断裂强度。
In 390 Ma from Sinian to Silurian,there existed a structure with a rise and two depressions in the palaeohigh, the sourthern flank of the Palaeohigh subsided faster than the palaeohigh itself rose by 45.63%, than northern flank subsided by 23.3% annually, which indicates that the palaeohigh was a inheritive one. High pressure, strong resistance force and the development of faults and fractures on steep fland resulted in connection and development of dissolved pores and vugs. So, exploring for large-middle size reservoirs are simply focusing on high and steep areas, which is decided by the condition of formation of the reservoirs in the palaeohigh; On the other hand, sedimentary and diagenesis environments are the decisive factors for the reservoirs porosity and pearmeability. The target areas with rich pores and vugs, good connection and high industrial gas well success rata are located in intertidal deposition with meteoric diagenesis environment; As for the carbonate in subtidal deposition with marine diagenesis environment ,reservoirs can be formed only under the condition of fractures linking pores and vugs, of cause, the development of fracture needs a certain folding and faulting strenth.
出处
《西南石油学院学报》
CSCD
1997年第4期1-8,共8页
Journal of Southwest Petroleum Institute
基金
国家"八五"课题
关键词
盆地
成岩作用
沉积相
油气藏
成藏
Caledonian palaeohigh
Intertidal zone
Subtidal zone
Sedimentary environment
Diagenesis
Sedimentary facies
Oil-gas reservoir
Sichuan basin
