川西坳陷中段中深层致密储层的裂缝识别

川西坳陷中段中深层碎屑岩致密化程度高,以裂缝性储层为主,裂缝发育程度决定了油气井的产量。裂缝的常规测井特征表现为密度测井呈尖蜂状异常、密度值降低、声波时差增大、电阻率曲线呈尖蜂状中高值;测井地应力剖面具有高泊松比、低杨氏模量和低抗压、低抗张强度;三轴应力表现为最小水平主应力增加和最大水平主应力减小的“瓶颈”现象。

Fracture Identification of Mid-deep Reservoir in the Middle Section of Western Sichuan Depression

Clastic rocks in mid-deep zone in the middle position of Western Sichuan Depression is highly compacted, where fractured reservoir is dominated, production of oil and gas well is determined by fracture growth. The characteristics of conventional logging of the reservoir is that logging density is peak abnormal, density reduces, interval transit time increases, resistivity curve is peak-like mid-high value. Profile of geostress logging is of high Poisson's ratio, low Young's modulus, low compressive resistance and tensile strength. Triaxial stress presents minimum horizontal principal stress increasing and maximum horizontal principal stress being a "bottleneck".