Study On The Relationship Between Crack Development And Yield Of Chang 8 In Zhenbei - Hehe Area

Zhenbei-Heshui Area is located in the southwest of Erdos Basin, Chang8Member of Yanchang Formation is widely distributed in this area. It is the main oil-bearing formation, but the degree of oil is heterogeneity, oil production of single well has the very big difference, its ability of Oil and gas production is related to the development situation of the fractures in reservoir. Based on the study of the block’s acoustoelectric imaging logging data analysis, in combination with core analysis, this paper makes the statistical analysis on the fracture occurrences, height, position, further summarizes the distribution and development degree of tectonic fractures in Chang8Member, studies the relationship between the fracture distribution, development degree and lithology, structure height, discusses the influence of the degree of fracture development by change of the reservoir porosity, provides technical support for exploration and development. At the same time we analysis the characteristics of the fracture distribution, development degree through the comparison. According to the single well fracture development position, scale and reservoir thickness, physical property, oil production test data, analyze the impact of the characteristics of the fracture development on yield, provide a reference for conventional logging interpretation and advice for optimizing fracturing treatment.The results show that the number of fractures in the surrounding rock is more than those in the reservoir. There is a negative correlation between the reservoir development degree and fracture development degree, and in the same lithology, there is a negative correlation between fracture density and slice thickness. But in the fracture developed area, the fracture was half filled by calcite or argillaceous, reservoir space of fracture has been broken down. It shows that in the formation conditions, the fracture is not the main reservoir space effectively and seepage channel, but it will become hydrocarbon migration channel after the fracture of surrounding rock is collusion by fracturing.