临兴G区块致密气藏产能影响因素分析

Analysis of Influencing Factors on Production Capacity of Tight Gas Reservoir in Linxing G Block

临兴G区块位置处于鄂尔多斯盆地东缘晋西挠褶带,上石盒子组气藏发育为气水混合带,下石盒子组发育多套气层。通过已钻井的储层岩石特征、岩心分析化验资料、地震、测井及试气资料,结合区域构造演化、沉积特征,分析G区块石盒子组致密气藏的地质条件和产能影响因素。结果表明:受离石走滑断裂带影响,越靠近区块东侧,平面上气层含水逐步发育,纵向上含水层发育逐渐靠下部地层,且具有相变快的特征,成为其产能的主要影响因素。

Linxing G block is located in the Jinxi flexural belt at the eastern margin of Ordos Basin. The upper Shihezi formation gas reservoir develops into a gas-water mixed zone, while the lower Shihezi Formation has multiple gas formations. Based on the well drilled reservoir rock characteristics, core analysis and laboratory data, seismic, well logging and gas test data, combined with regional structural evolution and sedimentary characteristics, the geological conditions and productivity factors of the tight gas reservoir of Shihezi Group in Block G are analyzed. The results show that, as the Lishi strike-slip fault zone is affected, the closer to the eastern side of the block, the water content of the gas layer in the plane gradually develops, and the aquifer in the longitudinal direction gradually develops to the lower stratum, and the phase transition is rapid, which becomes the main factor affecting its productivity.