| The right block is located on the middle-west part of Chaerju tectonic zone ofArmu basin, Turkimanistan.The carbonate og Carluofu-Oxford formation is the majorexploration target, the reservoir at middle of the study area is mainly reef flatdevelopment of the ups and downs slopes which is not difficult for exploration; thereservoir at eastern mountain front part of the study area is relatively densification andis mainly fracture type which is difficult of exploration.This article has developed studying on3D seismic data, well logging, testing andcore data of eastern mountain front part. Based on sedimentary environment and rockformation analysis of carbonate rock, we summarize that interpretation of the topboundary of carbonate rock formations exactly is the key point. Therefore, we didaccurate calibration of the seismic horizon and then through forward modelinganalysis to guide the interpretation of carbonate rock formations. It can makeconstruction details clear and provide reliable interface to stress field analysis, VSPand prestack P-wave anisotropic crack detection.On the basis of clear construction details, we study of fracture detection throughmulti-azimuth nonzero partial VSP data of well Aga-23. We mainly extract andanalysis plenty of seismic attributes of crack detection, including: P-wave&S-waveinterval velocity, poisson ratio,the capacity of transmissiveP-wave&S-wave,absorption attenuation coefficient, Q value, frequency, direction ofpolarization of S-wave and travel-time difference etc.Base on these data,we forecastthe fracture development of CBIL of well Aga-23is mainly north-north-west secondlyare north-north-east,it is agreed with the imaging logging interpretation.In order to forecast the degree of development of fracture we conducted aprestack P-wave crack detection technology application research in agaileistructure.What is different with normal prestack P-wave crack detection is that wefocus on CMP gather first.We first did prestack cover picture broadband HR processing gathers information to achieve a better gathers data then did azimuthoverlay treatment,optimizing the azimuth frequency attribute for the study of fracturedensity and azimuth.Through the compare of the VSP cracks results, the crack detection based onprestack P-wave and the logging data, we have got a more reliable research results.Combined with the results of the three studies above, we can summarized that themajority of fracture were high angle fracture in this zone, and they were mainlylongitudinal developed in XVa1layer, and they were horizontal distributed in thenorth and southwest. Stress field modeling shows that in fracture development zoneand structural high position they all have obvious abnormal that means the main partof study area is stress concentration, this is a good conditions of fracture development;the post-stack coherent shows that agailei structural main portion coherent anomalyzone is mainly large scale fracture and distribute near a small amount of fault;anomaly belt of prestack fracture detection are small scale high angle fracture, it hashigh development degree and wide spread in constructor body,that indicated that thisarea has great exploration potential.This article thorough studied of fracture detection through multi-azimuth nonzeropartial VSP data Combining VSP data and surface seismic fracture for the first time,it makes3D seismic fracture detection much more reliable, expands a new thinkingof fracture prediction and valuation, provides a more reliable technological mean forfractured reservoir exploration. It has extensive application prospect and valuation. |
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