论四川盆地下三叠统嘉陵江组三—四段天然气勘探

四川盆地嘉陵江组三—四段气藏,主要分布在泸州古隆起核部周边及其延伸部分,而于古隆起核部则未获一个气藏。究其原因,主要是由于该储层自身缺乏生气条件;从气源层又无向上断达嘉三—嘉四段储层的断层存在;古隆起核部因曾遭受早印支运动强烈的剥蚀,已无嘉四段良好的石膏岩作盖层。研究认为,嘉三—嘉四段储层是以古岩溶缝、洞为基础,几经演变后,并为晚期构造和构造缝复杂化了的储层,其储集空间并不受构造的限制,即使是向斜也可能有古岩溶缝洞和裂缝存在,勘探领域相当宽广。因此,进一步勘探主要应放在该古隆起核部周边及其向西和向东延伸的地区。

A Discussion on Exploration for Natural Gas in T_1j_(3-4) in Sichuan Basin

The 3rd and 4th members of Jialingjiang Formation(J3-4) concentrate in the periphery and extended part of the core of Luzhou palaeohigh,while no gas reservoir has been discovered in the core of the palaeohigh.The main cause is that there are no gas generating conditions in the core.At the gas source zone,there are no faults in the gas source zone that are connected with the J3-4 reservoir.Denuded by the Indochina movement,the core of the palaeohigh has no cap rocks like the J4 gyprock.Research shows that th...