Multi Attribute Fracture Prediction Study On Carbonate Reef Flat Area As An Example

YYL gas field is located in Sichuan county of Xuanhan Province, located in the northeast section of East Sichuan fold,according to the analysis of regional tectonic setting and tectonic characteristics of Eastern Sichuan, that is significantly affected by the two directions of bruchfalten tectonic stress influence by a snow mountain nappe belt level Dabashan nappe folds with the common stress superposition effect.The Xuefengshan nappe uplift stress field;Dabashan nappe fold belt for stress field.In Xujiahe formation,after indosinian of Yashan and Xishan tectonic movements,the formation of the structure of main longitudinal bend horizontal cracks and thrust faults,the franture crack growth with composition,not only greatly improved the permeability of reservoir,but also to a certain extent,controlling the gas accumulation, so that some dense layer was transformed into production layer has great industrial value.With the development of Chinese petroleum industry and rapid growth of the nationaleconomy the demand for energy increases, most of the conventional porous reservoir,gradually entered into the stage of high water cut, and fractured oil and gas reservoirproduction is increasing year by year. Fractured oil and gas reservoir refers to the cracks inthe main reservoir space, migration of oil and gas reservoirs, it is widely distributed in major basins.Because of the fractured reservoirs are generally reservoir lithology,physical property of complex high heterogeneity,reservoir space is complex and changeable,complicated causes,cause study and evaluation of geological logging interpretation of the difficulty,complexity and uncertainty of reservoir the prediction, multiple solutions of common features,fractured reservoirs the complexity of explora--tion and the conventional methods of the prediction of fractured reservior in recognition,difficulties,to reservoir evaluation has brought great difficulties and new challenges.The accurate prediction of the fracture zone is a prerequisite for reservoir evaluation, play a decisive role in the identification of fractured reservoirs. This paper mainly studies thecharacteristics of reservoir fracture in the main body, according to the core hole data, the area of the four core hole core and core casting crack thin sections were observed and statisticla analysis,crack development characteristics of different lithology,layer,statistics of the crack width,the sore size,production wells the shape,density,filling,dissolution and alteration etc..Through the analysis of cracks in the imaging logging image on the characteristics,establishment of imaging logging reservoir fracture response mode,the crack growth layer identification,description and statistical mechanics characteristics,fracture parameters such as fracture distribution and the main objective of the study area,reservoir layer dip layer crack range,joint opening and other major crack analysis.With the control of the factors influencing the development of fissures and cores,logging data,and then starting from the basic theory of seismic attributes,the seismic attributes analysis technology is applied to the block of YYL,rock property analysis,to understand the relationship between reservoir parameters,provide a strong theoretical basis to establish the seismic forward model then,through seismic forward modeling and geophysical response characteristics analysis,discussed the method of seismic identification of fractured zone,and the seismic attribute analysis, the screeni--ng of attributes,finally the results of the analysis and geological drilling data,compar--ative analysis,find the crack growth area.