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新场气田沙二气藏为多层叠置气藏,自上而下主要由4套含气砂体组成,共分为JS21、JS22、JS23、JS24四个气层,埋深为2200~2500m,平均孔隙度为10.2%,属低-中孔储层,试井解释有效渗透率低于0.1×10-3μm2,属典型的致密砂岩储层。新场沙二气藏累计提交探明地质储量534.35×108m3,动用地质储量445.08×108m3,累计采气量120.35×108m3,优质储量已全部动用,解释级别较低的致密砂岩气层动用程度较低。随着压裂改造工艺技术的进步,在以前难动用的储层上建产,将成为该气藏稳产的重要手段。根据各地质参数对油气的不同响应特征,建立了超平衡钻井条件下气测值的校正与恢复方法、地质指标权重评价等录井解释评价新技术,并利用该技术,对原来解释级别较低的致密砂岩气层潜力进行了再评价,筛选出了该类气层的潜力级别,为老井挖潜和气藏后期开发部署提供技术支撑。
The Sha-2 gas reservoir in Xinchang gas field is a multi-layer gas reservoir, which is mainly composed of 4 sets of gas-bearing sand bodies from top to bottom. It is divided into four gas layers of JS21, JS22, JS23 and JS24 with a depth of 2200-2500m. The average porosity is 10.2%. It belongs to the low-mesopore reservoir. Well testing shows that the effective permeability is less than 0.1 × 10-3μm2, which is a typical tight sandstone reservoir. The new reservoir Sha2 gas accumulatively submitted proven geological reserves of 534.35 × 108m3, the utilization of geological reserves of 445.08 × 108m3, the cumulative gas production of 120.35 × 108m3, the high-quality reserves have been fully utilized, the interpretation of the lower level of tight sandstone gas utilization is low. With the improvement of fracturing technology, building on previously difficult reservoirs will become an important means of stabilizing the gas reservoir. According to the different response characteristics of geologic parameters to oil and gas, this paper established a new method of logging interpretation and evaluation, such as calibration and recovery of gas measurement under over-balanced drilling conditions and weight evaluation of geological indicators. By using this technique, The potential of tight gas reservoirs was re-evaluated, and the potential levels of such gas reservoirs were screened to provide technical support for tapping the potential of the old wells and the later development and deployment of gas reservoirs.