白马庙气田蓬莱镇气藏试井解释分析  

WELL TESTING INTERPRETATION OF PENGLAIZHEN GAS RESERVOIR IN BAIMAMIAO GAS FIELD

作　　者：佘军[1] 

机构地区：[1]中油西南油气田分公司勘探开发研究院

出　　处：《天然气勘探与开发》2005年第1期31-33,共3页Natural Gas Exploration and Development

摘　　要：白马庙侏罗系蓬莱镇气藏的生产井基本都进行过压裂增产措施。从试井解释成果来看, 白马庙蓬莱镇气藏各井均存在不同程度的储层污染, 储层渗流特征复杂, 近井区的储层渗透性较好, 而远井区渗透性较差。因此气井压裂后, 储层的压力在近井地带下降较快, 距井底越远压力下降越慢或保持不变。试井曲线形态与有限导流垂直裂缝模型的试井曲线很相似, 但是在定量分析基础上, 有限导流裂缝的双线性流特征占次要地位, 远井区渗透性变差的特征占主导地位, 而后一种特征是低速非达西渗流效应引起的。在近井区, 压力梯度较大, 微观的高、中、低渗透孔隙内的流体都能流动, 反映出真实渗透能力; 而在远井区, 压力梯度较小, 只有微观的高渗透孔隙内的流体流动, 地层渗透性较差。Fracturing stimulation has been conducted for almost every productive well in Penglaizhen gas reservoir of Baimamiao Jurassic. According to the well testing interpretation, the pays of all the wells in Penglaizhen gas reservoir of Baimamiao are polluted at different levels, the percolation features of the pays are complicated, the permeability near borehole is good and the permeability far from borehole is poor. Therefore, after fracturing, the reservoir pressure drops down fast in the area near borehole and the reservoir pressure drops down slow or keeps unchanging in the area far from borehole. The well testing curves are similar to the well testing curves of the model with the vertical fractures of finite conductivity. According to the quantitative analysis, it is found the bilinear flow of finite conductivity fractures accounts for secondary position and the features of permeability deterioration in the area far from borehole account for leading position. The features are caused by the effect of non-Darcy flow with low velocity. In the area near borehole, since the pressure gradient is big, all the fluid in the microscopic pores with high, medium and low permeability can flow, which reflects the real permeability. In the area far from borehole, since the pressure gradient is small, only the fluid in the microscopic pores with high permeability can flow, and the permeability of the formation is poor.

关 键 词：试井解释 白马庙气田 气藏 有限导流 压力梯度 渗透性 储层污染 渗流特征 气井压裂 近井地带 压力下降 试井曲线 裂缝模型 曲线形态 分析基础 主导地位 渗流效应 渗透能力 流体流动 生产井 侏罗系 线性流 低渗透 高渗透 

分 类 号：TE353[石油与天然气工程—油气田开发工程] P618.130.2[天文地球—矿床学]