新場(chǎng)氣田須五段地應(yīng)力特征研究及應(yīng)用
發(fā)布時(shí)間：2019-02-26 14:48
【摘要】：新場(chǎng)氣田須五段資源量豐富,研究巖石力學(xué)參數(shù)及地應(yīng)力,有利于促進(jìn)氣藏的高效開發(fā),確保壓裂措施改造增產(chǎn)增效。本次研究針對(duì)新場(chǎng)氣田須五段地層,系統(tǒng)的進(jìn)行了巖石力學(xué)參數(shù)實(shí)驗(yàn),了解新場(chǎng)地區(qū)須五段砂巖、泥巖的彈性參數(shù)特征以及強(qiáng)度參數(shù)特征:(1)新場(chǎng)須五地層砂泥巖變形特征差異明顯,砂巖的強(qiáng)度高于泥巖,砂巖以為彈性變形為主,泥巖以塑性變形為主;(2)隨著圍壓的增加,砂巖和泥巖的屈服應(yīng)力水平均增加,并且砂巖增加的更快,砂巖的屈服應(yīng)力水平明顯大于泥巖,而屈服應(yīng)變小于泥巖;(3)砂巖的抗壓強(qiáng)度、楊氏模量隨著圍壓增加而增加,泊松比較離散,泥巖三者均隨圍壓的增加而增加。圍壓條件下,砂巖的抗壓強(qiáng)度、抗張強(qiáng)度、內(nèi)聚力、內(nèi)摩擦角、楊氏模量均高于泥巖,泊松比低于泥巖。以實(shí)驗(yàn)測(cè)試為基礎(chǔ),建立動(dòng)靜態(tài)參數(shù)轉(zhuǎn)化關(guān)系,利用測(cè)井資料針對(duì)砂巖、泥巖分別建立了地層巖石抗張強(qiáng)度、抗壓強(qiáng)度、內(nèi)聚力、內(nèi)摩擦角、彈性模量、泊松比、斷裂韌性、脆性指數(shù)等巖石力學(xué)參數(shù)預(yù)測(cè)模型并建立了巖石力學(xué)參數(shù)剖面。統(tǒng)計(jì)分析研究區(qū)巖石力學(xué)參數(shù)的分布特征。統(tǒng)計(jì)分析研究區(qū)巖石力學(xué)參數(shù)的分布特征。按照砂、泥巖分開統(tǒng)計(jì)研究區(qū)須五段楊氏模量、泊松比、抗壓強(qiáng)度的區(qū)間分布。依據(jù)壓實(shí)理論,建立了正常的壓實(shí)曲線,并對(duì)地層的孔隙壓力預(yù)測(cè)方法進(jìn)行了優(yōu)選,最終選擇伊頓法進(jìn)行區(qū)塊的孔隙壓力的預(yù)測(cè),預(yù)測(cè)結(jié)果較為準(zhǔn)確,并建立了新場(chǎng)地區(qū)須五段的孔隙壓力剖面。在此基礎(chǔ)上采用聲發(fā)射實(shí)驗(yàn)、差應(yīng)變測(cè)試和壓裂資料法分別計(jì)算了新場(chǎng)須五地層地應(yīng)力大小;運(yùn)用ADS法確定地應(yīng)力測(cè)井解釋模型,計(jì)算結(jié)果較為準(zhǔn)確,根據(jù)計(jì)算結(jié)果建立20口井的地應(yīng)力剖面;根據(jù)成像測(cè)井、微地震監(jiān)測(cè)等方法確定新場(chǎng)地區(qū)須五段地應(yīng)力方向。研究了新場(chǎng)地區(qū)須五段的地應(yīng)力分布的影響因素,分別從巖石力學(xué)性質(zhì)、巖性、深度以及構(gòu)造等方面分別探討:(1)新場(chǎng)氣田須五段的巖石力學(xué)參數(shù)主要影響水平最大、最小主應(yīng)力,砂巖表現(xiàn)出巖石力學(xué)參數(shù)與地應(yīng)力之間的相關(guān)性更強(qiáng)。(2)隨著深度增加,對(duì)砂巖和泥巖垂向應(yīng)力和水平最小主應(yīng)力的增加速度相似,而對(duì)于最大主應(yīng)力,在泥巖地層,最大主應(yīng)力隨著深加其增加速度要大于在砂巖地層其增加速度。(3)從構(gòu)造的角度分析地應(yīng)力大小方向變化的原因�，F(xiàn)今構(gòu)造部位如構(gòu)造的高點(diǎn)和翼部,構(gòu)造形態(tài)如斷層、褶皺、裂隙等的不同以及構(gòu)造地勢(shì)的陡緩如構(gòu)造的陡翼、傾俯端、鞍部往往產(chǎn)生應(yīng)力異常帶,造成現(xiàn)今地應(yīng)力特征分布的不同。應(yīng)用水力壓裂法對(duì)新場(chǎng)地區(qū)須五段進(jìn)行了的破裂壓力的預(yù)算,預(yù)測(cè)結(jié)果較為準(zhǔn)確。并建立了該區(qū)的破裂壓力剖面圖。通過分析研究新場(chǎng)氣田須五段的破裂類型多為KGD形。對(duì)工區(qū)內(nèi)的壓裂優(yōu)化分別從地質(zhì)因素和工程因素兩方面分析了影響壓裂增產(chǎn)的原因。
[Abstract]:The fifth member of Xinchang gas field is rich in resources. The study of rock mechanical parameters and in-situ stress is beneficial to promote the efficient development of gas reservoir and to ensure that fracturing measures can increase production and increase efficiency. This research is aimed at the strata of Xu5 member in Xinchang gas field, and systematically carries on the rock mechanics parameter experiment to understand the sandstone of Xuwu member in Xinchang area. The characteristics of elastic parameters and strength parameters of mudstone are as follows: (1) the deformation characteristics of sand and mudstone in Xinchang Xuwu formation are obviously different, the strength of sandstone is higher than that of mudstone, the main deformation of sandstone is elastic deformation, and the plastic deformation is dominant of mudstone; (2) with the increase of confining pressure, the yield stress level of both sandstone and mudstone increases, and the sandstone increases faster. The yield stress level of sandstone is obviously larger than that of mudstone, but the yield strain is smaller than that of mudstone; (3) the compressive strength and Young's modulus of sandstone increase with the increase of confining pressure, Poisson's ratio is discrete, and mudstone increases with the increase of confining pressure. Under confining pressure, the compressive strength, tensile strength, cohesion, internal friction angle and Young's modulus of sandstone are higher than that of mudstone, and Poisson's ratio is lower than that of mudstone. Based on the experimental test, the transformation relation of dynamic and static parameters is established. The tensile strength, compressive strength, cohesion force, internal friction angle, elastic modulus, Poisson's ratio and fracture toughness of sandstone and mudstone are established, respectively, according to the logging data, the tensile strength, compressive strength, cohesion force, internal friction angle, elastic modulus, Poisson's ratio and fracture toughness are established respectively. The prediction model of rock mechanics parameters such as brittleness index is established and the rock mechanics parameter profile is established. The distribution characteristics of rock mechanics parameters in the study area were analyzed statistically. The distribution characteristics of rock mechanics parameters in the study area were analyzed statistically. According to sand and mudstone, the interval distributions of Young's modulus, Poisson's ratio and compressive strength in the study area are calculated separately. According to the compaction theory, the normal compaction curve is established, and the prediction method of formation pore pressure is optimized. Finally, the Eaton method is selected to predict the pore pressure of the block, and the prediction result is more accurate. The pore pressure profile of Xuwu section in Xinchang area is established. On this basis, acoustic emission experiment, differential strain test and fracturing data method are used to calculate the ground stress of the five strata in the new field respectively. The ADS method is used to determine the interpretation model of in-situ stress logging, and the calculated results are more accurate. According to the calculated results, the in-situ stress profiles of 20 wells are established, and according to the methods of imaging logging and micro-seismic monitoring, the direction of in-situ stress of five segments in Xinchang area is determined. The influence factors of in-situ stress distribution of Xu5 member in Xinchang area are studied and discussed from the aspects of rock mechanics property, lithology, depth and structure. (1) the main influence level of rock mechanical parameters in Xu5 section of Xinchang gas field is the biggest. The minimum principal stress, the sandstone shows a stronger correlation between rock mechanical parameters and in-situ stress. (2) with the increase of depth, the increase rate of vertical stress and horizontal minimum principal stress of sandstone and mudstone is similar, but for the maximum principal stress, the increase rate of vertical stress and horizontal minimum principal stress of sandstone and mudstone is similar with the increase of depth. In mudstone strata, the maximum principal stress increases faster with the increase of depth than in sandstone. (3) the reason of the change of in-situ stress is analyzed from the point of view of structure. At present, structural positions such as the high point and wing of the structure, the differences of the structural forms such as faults, folds, fissures, etc., and the steep wings of the tectonic terrain, such as the steep wings of the structure, the dipping end, and the saddle tend to produce stress anomaly zones. It causes the difference of the distribution of the in-situ stress characteristics. The hydraulic fracturing method is used to estimate the fracture pressure of the five segments in Xinchang area, and the prediction results are more accurate. The fracture pressure profile of the area is also established. Through the analysis, the fracture type of Xuwu member in Xinchang gas field is mostly KGD shape. In this paper, the factors affecting fracturing production are analyzed from two aspects: geological factors and engineering factors.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13
本文編號(hào)：2430879
[Abstract]:The fifth member of Xinchang gas field is rich in resources. The study of rock mechanical parameters and in-situ stress is beneficial to promote the efficient development of gas reservoir and to ensure that fracturing measures can increase production and increase efficiency. This research is aimed at the strata of Xu5 member in Xinchang gas field, and systematically carries on the rock mechanics parameter experiment to understand the sandstone of Xuwu member in Xinchang area. The characteristics of elastic parameters and strength parameters of mudstone are as follows: (1) the deformation characteristics of sand and mudstone in Xinchang Xuwu formation are obviously different, the strength of sandstone is higher than that of mudstone, the main deformation of sandstone is elastic deformation, and the plastic deformation is dominant of mudstone; (2) with the increase of confining pressure, the yield stress level of both sandstone and mudstone increases, and the sandstone increases faster. The yield stress level of sandstone is obviously larger than that of mudstone, but the yield strain is smaller than that of mudstone; (3) the compressive strength and Young's modulus of sandstone increase with the increase of confining pressure, Poisson's ratio is discrete, and mudstone increases with the increase of confining pressure. Under confining pressure, the compressive strength, tensile strength, cohesion, internal friction angle and Young's modulus of sandstone are higher than that of mudstone, and Poisson's ratio is lower than that of mudstone. Based on the experimental test, the transformation relation of dynamic and static parameters is established. The tensile strength, compressive strength, cohesion force, internal friction angle, elastic modulus, Poisson's ratio and fracture toughness of sandstone and mudstone are established, respectively, according to the logging data, the tensile strength, compressive strength, cohesion force, internal friction angle, elastic modulus, Poisson's ratio and fracture toughness are established respectively. The prediction model of rock mechanics parameters such as brittleness index is established and the rock mechanics parameter profile is established. The distribution characteristics of rock mechanics parameters in the study area were analyzed statistically. The distribution characteristics of rock mechanics parameters in the study area were analyzed statistically. According to sand and mudstone, the interval distributions of Young's modulus, Poisson's ratio and compressive strength in the study area are calculated separately. According to the compaction theory, the normal compaction curve is established, and the prediction method of formation pore pressure is optimized. Finally, the Eaton method is selected to predict the pore pressure of the block, and the prediction result is more accurate. The pore pressure profile of Xuwu section in Xinchang area is established. On this basis, acoustic emission experiment, differential strain test and fracturing data method are used to calculate the ground stress of the five strata in the new field respectively. The ADS method is used to determine the interpretation model of in-situ stress logging, and the calculated results are more accurate. According to the calculated results, the in-situ stress profiles of 20 wells are established, and according to the methods of imaging logging and micro-seismic monitoring, the direction of in-situ stress of five segments in Xinchang area is determined. The influence factors of in-situ stress distribution of Xu5 member in Xinchang area are studied and discussed from the aspects of rock mechanics property, lithology, depth and structure. (1) the main influence level of rock mechanical parameters in Xu5 section of Xinchang gas field is the biggest. The minimum principal stress, the sandstone shows a stronger correlation between rock mechanical parameters and in-situ stress. (2) with the increase of depth, the increase rate of vertical stress and horizontal minimum principal stress of sandstone and mudstone is similar, but for the maximum principal stress, the increase rate of vertical stress and horizontal minimum principal stress of sandstone and mudstone is similar with the increase of depth. In mudstone strata, the maximum principal stress increases faster with the increase of depth than in sandstone. (3) the reason of the change of in-situ stress is analyzed from the point of view of structure. At present, structural positions such as the high point and wing of the structure, the differences of the structural forms such as faults, folds, fissures, etc., and the steep wings of the tectonic terrain, such as the steep wings of the structure, the dipping end, and the saddle tend to produce stress anomaly zones. It causes the difference of the distribution of the in-situ stress characteristics. The hydraulic fracturing method is used to estimate the fracture pressure of the five segments in Xinchang area, and the prediction results are more accurate. The fracture pressure profile of the area is also established. Through the analysis, the fracture type of Xuwu member in Xinchang gas field is mostly KGD shape. In this paper, the factors affecting fracturing production are analyzed from two aspects: geological factors and engineering factors.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13
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