塔里木盆地孔雀河斜坡页岩气成藏条件与有利区带评价

孔雀河斜坡下寒武统西大山组、中寒武统莫合尔山组和中下奥陶统黑土凹组发育海相富含有机质的黑色泥页岩.通过野外露头、钻井及地震等资料分析,认为孔雀河斜坡这2套泥页岩厚度大、分布广、有机质丰度高、有机质类型好、热演化程度高、微孔隙和微裂缝发育、含脆性矿物、保存条件较好及埋深适宜,具备形成页岩气的条件.根据埋深和保存条件,预测尉犁断阶带、群克构造带北部和中部斜坡带北部为孔雀河斜坡页岩气勘探的有利区带.

Accumulation conditions and favorable exploration zones of shale gas in Kongquehe Slope,Tarim Basin

In the Lower Cambrian Xidashan Formation, the Middle Cambrian Moheershan Formation and the Middle-Lower Ordovician Heituwa Formation in the Kongquehe Slope, marine facies black shale rich in organic matter was developed. Outcrop observations and the integrated analyses of drilling and seismic data indicated that the shale was featured by big thickness, wide distribution, high organic matter abundance, favorable organic matter type, high thermal maturity, well-developed micro-pore and micro-fracture, brittleness mineral, favorable preservation condition, and moderate burial depth, which were favorable for shale development. Several favorable exploration zones in the Kongquehe Slope were predicted, such as the Yuli fault belt, the northern Qunke tectonic belt and the northern Central slope.