川西白马庙气田蓬莱镇组低效气藏地质成因模式及开发思路

依据储量丰度和产能标准,川西白马庙气田侏罗系蓬莱镇组气藏为典型的低效气藏.通过分析沉积、成岩和构造作用对储层的影响.认为沉积作用为相对高效储层最主要的控制因素.高效储层的发育主要受沉积相带的控制,厚度大物性好的分流河道和河口坝砂体的预测是气藏高效开发的关键.最后提出了以高分辨率层序层研究为基础,在高分辨率基准面旋回地层格架内,分析基准面变化与储层特征及储层展布间关系,利用基准面变化进行垂向有利层段和平面有利相带预测的气藏高效开发思路.

On Geologic Genetic Mode of Low Efficient Gas Reservoirs and Consideration of Its Development of Penglaizhen Formation in Baimamiao Gas Field in Western Sichuan

Based on reserves abundance and productivity criterion, the gas pool of Jurassic Penglaizhen Formation of Baimamiao Gas Field in Western Sichuan belongs a typical low efficient Gas Reservoir. The effects of deposition, diagenesis and tectogenesis on reservoirs are analyzed. It is considered that the deposition is the major control factor of relatively high efficient reservoirs. The development of high efficient reservoirs are mainly controlled by depositional facies , the prediction of distributary channels and mouth bars with big thickness and good physical properties is the key of high efficient development of gas reservoirs. It is proposed that based on the study of high resolution sequence stratigraphy, a high resolution base-level cyclic formation framework is established for analyzing the changes of base level and relation between reservoir physical properties and its distribution. The application of base-level changes is a new idea for predicting high efficient gas reservoir production in vertical beneficial intervals and areal beneficial facies belts.