Abstract：The Longmaxi Formation in Sichuan Basin,China is rich in shale gas resources.In order to identify the distribution of shale gas sweet spots in the area and propose a good horizontal-well deployment,we conduct a research for the sweet spot distribution based on 3D seismic data.Poststack and prestack seismic data are used to predict fracture developments and directions.The total organic carbon (TOC) and brittleness are established on logging crossplots and elastic parameters.The relationship between Young's modulus and density (E*Rhob) is obtained with prestack elastic parameter inversion,and elastic parameter combinations (E*Rhob) show shale brittleness and TOC.Finally,shale reservoir fractures,TOC,and brittleness distribution are comprehensively analyzed,and favorable sweet spots are identified.Our research results demonstrate that favorable shale sweet spot zones are well predicted,which lay a solid foundation for horizontal-well trajectory design to reduce exploration risks.
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