【作者】 李毓；

【导师】 周文；

【作者基本信息】 成都理工大学 ， 油气田开发工程， 2004， 硕士

【摘要】 本次论文研究充分利用水力压裂法、岩石声发射法、测井法等现今地应力计算方法及有限元法现今地应力场模拟对川西坳陷中部侏罗系地层蓬莱镇组和沙溪庙组的现今地应力场进行分析、计算、模拟，得到研究区现今地应力场分布特征及规律。 在大量原始资料和计算数据资料的基础上，系统分析了影响本区现今地应力分布特征的各种地质因素包括岩石力学性质、岩性、深度、层位和构造的形态、部位、地势等。 分析了地应力特征和压裂缝的关系，表明地应力分布特征主要影响压裂缝产状和压裂缝参数.研究区地层中存在三种不同地应力状态，导致压裂缝的三种不同破裂方式，结合前人的研究成果，利用压裂资料建立判别模型，对已压裂井进行判别，分析出不同层位的地应力状态。 分析并找出了偏应力和破裂压力、压裂缝延伸半长、压后增加产能之间的关系。考虑主应力值和偏应力值的分布大小、地应力状态、目的层和隔层应力差、压裂井所处构造位置，并结合前人划分的地应力剖面类型标准，提出了本区压裂选层的标准及相关参数。 最后分析压裂缝方位、长度并结合研究区的地应力状态特征，提出了作为开发参考的井网距及井排方向参数。更多还原

【Abstract】 The paper mainly analyzes and evaluates the distribution characteristics and laws about the present ground stess field at Jurassic in mid of West-Sichuan-Dep-ression by means of stess calculation method including Hydrofr -acturing method,Rock Acoustic Emission method and Logging method combined with stress field finite element simulation.On base of a quantity of original data and calculated data,after systemi -cly analyzing many geologic factors such as rock mechanical property.drilli-ng-hole depth,formation and tectonic shape,location and hypsography etc.whi -ch influnce the present ground stress field distributing characteristics and laws,a series of theoretical viewpoints and research fruition are concluded.After analyzing relation between stress characteristics and hydrofracturi-ng fracture, then a conclusion comes into being that the present ground stress characteristics mainly influnce fractured model and parameters of fracture.There exist three diverse stress state resulting in three different fractu -red models in destination area.Comibined with former research fruitions, a identifying model is found by using hydrofracturing information so as to dist -inguish fractureextended states.And after applied this identifying model to all hydrofractured wells,the present ground stress states in penglaizhen and shaximiao formation are mastered.By statistic,generation and deducing,the mutual ralation appear between deviation stress and fractured pressure,fracture extended length .increased production quantity of natural gas.Considering numerical value of principal stress and deviation stress,stress state characteristics,tectonic location,stres s difference between destination layer and segregation layer and the criterion which classify the present ground stress profile,a standard about how to select a layer for executing hydrofracturing is established including some related parameters in paper.Finally through anlysing fracture direction and length,indispensablly synthetical considering the present ground stress characteristics state, the par -ameters about direction and distance between wells are determined at Jura -ssic in mid of West-Sichuan-Depression in paper.更多还原