The Fracture Prediction Of The 5th Member Of Xujiahe Formation In West Sichuan

As shale gas, tight sandstone gas and igneous reservoir exploration and development of unconventional reservoirs, such as crack research highlights a more and more important position. Fractures of reservoir migration, accumulation and reservoir has a significant impact, are not only good for migration of oil and gas reservoirs and reservoir, also the existing reservoir formation damage, and the existence of a large number of tiny cracks to improve reservoir reservoir properties have an important role. Because of the complexity of the fracture, and the diversity of size problem, how to predict fracture of the stronger, a single subject or a single method to predict the fracture development zone, are often difficult to obtain the ideal effect, combining with many methods of multi-disciplinary applications help reduce multiple solutions, improve the credibility of the fracture prediction.This paper takes the 5th member of Xujiahe Formation as an example in XinChang District, using a variety of post-stack fracture prediction techniques to predict the favorable development of fracture zone.The Xujiahe Formation is one of the main gas-bearing strata. The 5th member of Xujiahe Formation is a typical, self-generated and the reservoir lithology is dense, lateral heterogeneity is strong, for the fracture pore type and reservoir type servoir effectiveness is closely related to the crack. So it has very important significance for searching the fracture prediction technology of the 5th member of Xujiahe Formation and pointing out the favorable development of fracture zone.Firstly, it collects predecessors’ information, statistical work area within the well type and the situation of the development, inoue analysis of crack on the logging response characteristics, analysis of inoue fracture development degree. Secondly, it searches for seismic response characteristics of fracture development period of corresponding inoue by looking well fine well-to-seismic calibration, analysizes fracture section of the seismic section the reflection characteristics, extracts the corresponding seismic attribute to the analysis of the characteristics of the fracture zone in the attribute chart. It depends on four purpose layers of structure map, combines with the characteristics of the fracture on the seismic profile, and identifies the fracture, crack tectonic belt.According to fracture scale problem, the combination of high and low resolution to extract different seismic attributes. Dip technology can clearly identify the fault and fracture development zone, fault and fracture for delineating generally distribution range, the qualitative analysis of the distribution of fault-fracture system. Extract four purpose layer along the coherent properties and analyse the favorable development of check purpose layer along the crack area. Ant body fracture identification technology mainly aims at the recognition of small faults and microcracks, with reference to geological structure conditions and stress analysis to set up the reasonable parameters, small faults and microcracks tracking and recognition, check the crack favorable development zone. Integrated various post-stack areas favorable for fracture prediction method to predict the crack, dip as reference, the key technology combining coherent properties and ants, the comprehensive benefit of fracture development is delineated area, with crack statistic results than inoue, comprehensive research results show that the fracture zone with inoue fracture plane distribution in general, higher credibility.