發(fā)布時間：2018-05-21 11:43

  本文選題：高廟地區(qū) + 沙溪廟組��； 參考：《成都理工大學》2015年碩士論文

【摘要】：在收集整理前人對高廟地區(qū)地質研究成果的基礎上,深入分析了高廟地區(qū)沙溪廟組儲層的基本地質特征、區(qū)域構造特征、儲層特征、工程地質特征,明確了高廟地區(qū)沙溪廟組的沉積特征、砂體展布特征以及氣藏動態(tài)特征;在巖石力學實驗的基礎上,建立了力學參數預測模型和剖面,分析了巖石力學參數特征;根據測井及壓裂資料,結合模型優(yōu)選方法,利用現有地應力測量及分析方法,優(yōu)選了高廟地區(qū)沙溪廟組氣藏地應力計算適宜模型,建立了地應力預測模型及剖面,明確了研究區(qū)地應力狀態(tài),地應力剖面特征,儲層地應力剖面類別特征,探討了破裂壓力異常高的原因,可以為地應力的現場應用提出合理建議。通過研究分析,取得如下結論:(1)高廟地區(qū)沙溪廟組氣藏巖石力學強度較大、非均質性強�？v向上,抗壓強度最低的是Js33-2氣層,最高是Js33-1氣層,Js23氣層居中;彈性模量與抗壓強度具有相似特征;泊松比具有從上到下增大趨勢;抗張強度Js23氣層最大,平均在7MPa左右,下沙溪廟組兩層基本相一致,大小相差不大。在平面上,力學參數規(guī)律性不強,但總體上還是存在力學參數從構造中部向兩翼降低趨勢。(2)根據研究區(qū)現今區(qū)域地應力場及氣藏區(qū)域構造特征,結合其地層巖石力學強度特征及現有地應力計算模型應用約束條件,高廟地區(qū)沙溪廟組氣藏地應力計算模型適宜采用組合彈簧模型。(3)通過對高廟地區(qū)沙溪廟組氣藏地應力狀態(tài)的分析,高廟地區(qū)沙溪廟組氣藏地應力狀態(tài)為σ最大σ垂向σ最小,屬走滑地應力模式。推測出高廟地區(qū)沙溪廟組最小水平主應力方位近南北向,最大水平主應力方位主體近東西向。(4)明確了高廟地區(qū)沙溪廟組主要砂體地應力大小及剖面特征,高廟地區(qū)沙溪廟組儲層與上下圍巖應力差值普遍較小,不利于裂縫高度的控制。地應力剖面主要有3種類型:高低高型、低低高型、平直型,而平直型主要分布在構造西南部。(5)高廟地區(qū)沙溪廟組儲層破裂壓力較高,在構造中部和北部較高,在構造西南部,破裂壓力有所降低,降低的原因可能是由于該區(qū)裂縫發(fā)育和儲層力學參數更低原因。
[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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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本文編號：1919052