Western Sichuan Depression Feng Gu Constructed Xujiahe Oil And Gas Reservoir Distribution

It's a difficult point of hydrocarbon prospecting in tight clast of the west depression of Sichuan basin. Since Upper Triassic, The west depression of Sichuan basin has experienced the complex multi-times tectonic movement, under this background, the reservoir has suffered strong diagenesis, specially with the damage of compression, Authigenic Quartz and Carbonate cement, it changed extremely tight, and the major part of reservoir matrix is tight or ultra tight, at the same time, the reservoir displayed the greatly heterogeneity, these for this local structure evolution aspect and so on characteristic, reservoir recognition and fluid characteristic have all brought the very big research difficulty.Based on the above reason, to conduct the research of this region must synthesize the well log and seismic technology. First, we made a normalization of log data of three wells that locate in Fenggu structure of the west depression of Sichuan basin. Next with the aid of fuzzy clustering, we realized various wells lithological recognition, the recognition effect well and the result is reliable. Finally has made the three wells oil gas interpretation in the optimal parameter foundation.The log interpretation is only longitudinal; it can be extrapolated on the base of seismic interpretation and the inversion. This article takes the high-resolution seismic data as a foundation, makes the interpretation of main horizons and faults. On the base of seismic interpretation, with the production of quasi-acoustic from gamma ray well log, we made an acoustic impedance inversion; the result of inversion can correctly reveal the horizontal distribution of the sandstone. At last, we made sandstone correlation by synthesizing the inversion result and well log interpretation, and obtained the oil gas reservoir distributed characteristic.