高庙地区沙溪庙组储层及其地应力特征研究

发布时间：2018-05-21 11:43

本文选题：高庙地区 + 沙溪庙组　；参考：《成都理工大学》2015年硕士论文

【摘要】：在收集整理前人对高庙地区地质研究成果的基础上,深入分析了高庙地区沙溪庙组储层的基本地质特征、区域构造特征、储层特征、工程地质特征,明确了高庙地区沙溪庙组的沉积特征、砂体展布特征以及气藏动态特征;在岩石力学实验的基础上,建立了力学参数预测模型和剖面,分析了岩石力学参数特征;根据测井及压裂资料,结合模型优选方法,利用现有地应力测量及分析方法,优选了高庙地区沙溪庙组气藏地应力计算适宜模型,建立了地应力预测模型及剖面,明确了研究区地应力状态,地应力剖面特征,储层地应力剖面类别特征,探讨了破裂压力异常高的原因,可以为地应力的现场应用提出合理建议。通过研究分析,取得如下结论:(1)高庙地区沙溪庙组气藏岩石力学强度较大、非均质性强。纵向上,抗压强度最低的是Js33-2气层,最高是Js33-1气层,Js23气层居中;弹性模量与抗压强度具有相似特征;泊松比具有从上到下增大趋势;抗张强度Js23气层最大,平均在7MPa左右,下沙溪庙组两层基本相一致,大小相差不大。在平面上,力学参数规律性不强,但总体上还是存在力学参数从构造中部向两翼降低趋势。(2)根据研究区现今区域地应力场及气藏区域构造特征,结合其地层岩石力学强度特征及现有地应力计算模型应用约束条件,高庙地区沙溪庙组气藏地应力计算模型适宜采用组合弹簧模型。(3)通过对高庙地区沙溪庙组气藏地应力状态的分析,高庙地区沙溪庙组气藏地应力状态为σ最大σ垂向σ最小,属走滑地应力模式。推测出高庙地区沙溪庙组最小水平主应力方位近南北向,最大水平主应力方位主体近东西向。(4)明确了高庙地区沙溪庙组主要砂体地应力大小及剖面特征,高庙地区沙溪庙组储层与上下围岩应力差值普遍较小,不利于裂缝高度的控制。地应力剖面主要有3种类型:高低高型、低低高型、平直型,而平直型主要分布在构造西南部。(5)高庙地区沙溪庙组储层破裂压力较高,在构造中部和北部较高,在构造西南部,破裂压力有所降低,降低的原因可能是由于该区裂缝发育和储层力学参数更低原因。
[Abstract]:On the basis of collecting and sorting out the geological research achievements of the former people in Gaomiao area, the basic geological characteristics, regional structural characteristics, reservoir characteristics, engineering geological characteristics of the Shaximiao formation reservoir in the Gaomiao area are analyzed in depth. The sedimentary characteristics, sand distribution characteristics and gas reservoir dynamic characteristics of Shaximiao formation in Gaomiao area are defined, and the prediction model and section of mechanical parameters are established based on rock mechanics experiments, and the characteristics of rock mechanical parameters are analyzed. According to the logging and fracturing data, combined with the model optimization method, using the existing methods of in-situ stress measurement and analysis, a suitable model for the calculation of in-situ stress of the Shaximiao formation gas reservoir in Gaomiao area is selected, and the prediction model and section of the in-situ stress are established. The characteristics of in-situ stress state, in-situ stress profile and reservoir in-situ stress profile are defined, and the causes of the abnormal high fracture pressure are discussed, which can provide reasonable suggestions for the field application of in-situ stress. Through research and analysis, the following conclusions are obtained: (1) the gas reservoirs of Shaximiao formation in Gaomiao area have strong rock mechanical strength and strong heterogeneity. Longitudinally, the Js33-2 gas layer has the lowest compressive strength, the highest is the Js33-1 gas layer Js23, the elastic modulus and compressive strength are similar, the Poisson's ratio increases from the top to the bottom, the tensile strength of the Js23 gas layer is the largest, and the average value is about 7MPa. The two layers of the Lower Shaximiao formation are basically the same, but the size is not different. On the plane, the mechanical parameters are not regular, but there is a tendency to decrease the mechanical parameters from the middle part of the structure to the two flanks.) according to the present regional stress field and the regional structural characteristics of the gas reservoir in the study area, Combined with the mechanical strength characteristics of strata and rock and the existing calculation model of in-situ stress, the constraint conditions are applied. Based on the analysis of the in-situ stress state of Shaximiao formation gas reservoir in Gaomiao area, the geostress state of Shaximiao formation gas reservoir in Gaomiao area is the maximum 蟽 vertical 蟽 minimum. It belongs to the mode of strike-slip geostress. It is inferred that the direction of the minimum horizontal principal stress of Shaximiao formation in Gaomiao area is near the north-south direction, and the main body of the maximum horizontal principal stress orientation is near east-west direction .4) the geostress and profile characteristics of the main sand bodies of Shaximiao formation in Gaomiao area are determined. The stress difference between the reservoir and the upper and lower wall rocks of Shaximiao formation in Gaomiao area is generally small, which is not conducive to the control of fracture height. There are three main types of in-situ stress profile: high and low high type, flat straight type, while flat type mainly distributes in southwest of the structure. The reservoir fracture pressure of Shaximiao formation is higher in Gaomiao area, higher in the middle and north of the structure, and in the southwest of the structure. The fracture pressure is reduced, which may be due to the development of fractures and the lower mechanical parameters of the reservoir.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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