鄂西利川复向斜南部石炭系——三叠系储层与评价

Reservoirs and Estimation of Carboniferous-Triassic in Southern Lichuan Synclinorium,West Sichuan Province

陈宗清

CHEN Zong qing

四川石油管理局 地质勘探开发研究院, 四川 成都 610051

Geological Exploration and Development Institute of Pertroleum Management Bureau, Chengdu Sichuan 610051

利川复向斜正处渝鄂边区,其南部石炭系——三叠系储层不仅有川渝气区的主要储层石炭系存在,并于齐岳山二叠系长兴组发现了具有较厚和较好储集条件的礁帽白云岩。且石炭系黄龙组的主要储层福成寨段、二叠系的茅口组灰岩和三叠系大冶组大三段的鲕粒灰岩储集条件均有由东向西变好的趋势。因此该复向斜西翼,以及齐岳山背斜带东、西两侧都是寻找上述储层气藏的良好所在,地腹若有圈闭存在,应是获气最有希望的地区。

The Lichuan synclinorium is located on the border between Chongqing city and Sichuan Province,it in carboniferous Triassic exists main carboniferous reservoir of Sichuan Chongqing gas area,and thick reef cap dolomite with good reservoir conditions has been found in Changxing formation of Permian at Qiyue Mountain. Reservoir conditions of main reservoirs in the Fuchengzhai member,Huanglong formation,Carboniferous,and Maokou formation limestone,Permian and oolitic limestone of Dasan member,Daye formation,Triassic turns well from east to west.Thus the west flank of the synclinorium,and both sides of the anticline of the Qiyue Mountain are good areas for gas reservoir exploration,moreover,should trap exists in the central base,it would be the most hopeful for obtaining gas.