关键词: 电成像测井, 岩相, 裂缝, 古水流, 沉积相, 苏里格气田

Abstract: Sulige gas fi eld is a typical gas reservoir of low permeability, low yield, low abundance and large lithology trap. The main gas layer is the eighth member of Shihezi Formation and the fi rst member of Shanxi Formation. Based on electric imaging logging data, seven lithofacies were identified in the eighth member of Shihezi Formation and the first member of Shanxi Formation, including cross-bedding mediumcoarse sandstone, cross-bedding medium-coarse sandstone containing gravel, parallel-bedding sandstone, clumpy conglomerate, graded bedding glutenite, massive-bedding sandstone, and micro-fracture sandstone. Fracture in the eighth member of Shihezi Formation and the fi rst member of Shanxi Formation was also identifi ed. In this paper, the relationship between the fracture and the gas production in gas-bearing zone was discussed, and the distribution law of fracture in plane was summed up. It was shown that physical property, lithology, gas content and thickness of reservoir were main factors controlling single well, while fracture was less important. Based on petrographic analysis, paleocurrent and sedimentary facies were analyzed. It was believed that low-sinuosity meander sedimentary facies developed the upper section of the eight member of Shihezi Formation, and braded river sedimentary facies mainly developed in the lower section. This was of certain directive signifi cance to natural gas exploration and development in this area