Research On Rock Mechanical Characteristics And Engineering Application In Heba Structure Northeastern-Sichuan

The paper mainly evaluates and analyzes the rock mechanical property,the ground stress field, the fracture pressure and the caving pressure section of whole layers( land facies mainly) at Heba structure in Northeastern-Sichuan by means of a great quantity of rock mechanical data combined with rock acoustic emission method,differential strain method and logging method. And then a interpretation for the culprit of the typical well sections which happened project accidents have obtained.On base of physical properties and rock mechanical properties of sea facies and land facies in region of interest are tested at the State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation in Chengdu University of Technology , systemically analyzing the experiment characteristics of rock mechanical properties such as rock intensive parameters, dynamic-static elastic parameters in both land facies and sea facies. And more, I have a clear realization on this structure.By utilizing the outcome of lab analysis and logging datum, ten rock mechanical parameter models such as vertical-horizontal acoustic time,tensile strength,compression strength,cohesive force,angel of internal friction and the relationship of dynamic-static elastic parameters are established. Then rock mechanical parameters'cut plane of typical well section at Haba structure is building.After analyzing the ground stress distributing characteristics of region of interest and choosing model of Hongkui Ge, the ground stress calculated model have been constructed by gotten parameters from original acoustic travel datum. And then the ultimate ground stress model and direction, typical ground stress cut plane of land facies are gained by means of differential strain method checking.Finally through analyzing the of fracture pressure,caving pressure and pore pressure,three calculation models are building and explanation cut plane of land facies of typical well is formation. Some typical formations with engineering accidents have been interpreted. But it just for referring because of never verified.