利用矿物含量计算砂岩脆性指数——以鄂尔多斯盆地合水地区长6段致密砂岩储层为例
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摘要
脆性指数是致密砂岩储层评价的重要参数,准确计算脆性指数为储层改造参数优化及"甜点"优选提供依据。通过岩石薄片鉴定和X射线衍射全岩分析,研究致密砂岩脆性矿物特征,提出利用"(石英+碳酸盐)含量/矿物总量"计算岩石脆性指数。结果表明合水地区主力层位三叠系延长组长63的脆性指数主要为50%~65%,平均为56.3%,与岩石力学测量值的符合率较高。高石英含量是形成长6段致密砂岩高脆性指数的主要原因,脆性指数>60%的储层大面积分布,利于体积压裂改造。
Brittleness index is one of the important parameters for reservoir evaluation of tight sandstone.Accurate computation of the parameter is helpful for optimizing reservoir stimulation parameters and optimal selection of hot spots.The characteristics of brittle minerals in tight sandstone are studied on the basis of identification of thin section and X-ray crystallography,a method of computing brittleness index by the formula of(quartz+carbonate)/total mineral content,is proposed.It shows that the brittleness index of the main oil-bearing sub-layer Chang-63 in Heshui areais high,ranging from 50%to 65%,with an average value of 56.3%,coincident with rock mechanics measured value.High contents of quartz are the main reason for the high brittleness index in the Chang-63 tight sandstone.Large scale distribution of reservoir with the brittleness index over 60%is suitable for the reformation of volume crush.
Brittleness index is one of the important parameters for reservoir evaluation of tight sandstone.Accurate computation of the parameter is helpful for optimizing reservoir stimulation parameters and optimal selection of hot spots.The characteristics of brittle minerals in tight sandstone are studied on the basis of identification of thin section and X-ray crystallography,a method of computing brittleness index by the formula of(quartz+carbonate)/total mineral content,is proposed.It shows that the brittleness index of the main oil-bearing sub-layer Chang-63 in Heshui areais high,ranging from 50%to 65%,with an average value of 56.3%,coincident with rock mechanics measured value.High contents of quartz are the main reason for the high brittleness index in the Chang-63 tight sandstone.Large scale distribution of reservoir with the brittleness index over 60%is suitable for the reformation of volume crush.
引文
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[17]杨俊峰,芮捍东,田建波,等.致密油藏多段压裂水平井初始产能影响因素分析[J].石油地质与工程,2014,28(6):65-68.Yang J F,Rui H D,Tian J B,et al.Influencing factors analysis of multi-stage fractured horizontal wells'initial productivity in dense reservoirs[J].Petroleum Geology and Engineering,2014,28(6):65-68.(in Chinese)
[2]张矿生,刘顺,蒋建方,等.长7致密油藏脆性指数计算方法及现场应用[J].油气井测试,2014,23(5):29-32.Zhang K S,Liu S,Jiang J F,et al.Calculation method about brittleness index in Chang 7dense reservoir and its field application[J].Well Testing,2014,23(5):29-32.(in Chinese)
[3]黄军平,张智盛,杨占龙,等.致密岩石矿物组分含量及脆性指数多元回归定量预测[J].新疆石油地质,2016,37(3):346-351.Huang J P,Zhang Z S,Yang Z L,et al.Quantitative prediction of mineral component content and brittleness index in tight rocks based on multivariate regression analysis[J].Xinjiang Petroleum Geology,2016,37(3):346-351.(in Chinese)
[4]姚昌宇,周瑞立,胡艾国,等.利用常规测井确定岩石杨氏模量以富县区块上古生界储层为例[J].石油地质与工程,2012,26(5):110-112.Yao C Y,Zhou R L,Hu A G,et al.Determination of Yong's modulus by using conventional logging:Take Upper Paleozoic reservoirs of Fuxian block as an example[J].Petroleum Geology and Engineering,2012,26(5):110-112.(in Chinese)
[5]石道涵,张兵,何举涛,等.鄂尔多斯长7致密砂岩储层体积压裂可行性评价[J].西安石油大学学报(自然科学版),2014,29(1):53-55.Shi D H,Zhang B,He J T,et al.Feasibility evaluation of volume fracturing of Chang-7tight sandstone reservoir in Ordos Basin[J].Journal of Xi'an Shiyou University(Natural Science Edition),2014,29(1):53-55.(in Chinese)
[6]许孝凯,翟勇,刘美杰,等.复杂储层岩石脆性分析及应用研究[J].测井技术,2015,39(4):486-490.Xu X K,Zhai Y,Liu M J,et al.Brittleness analysis of rock and its application to complex reservoir[J].Well Logging Technology,2015,39(4):486-490.(in Chinese)
[7]Obert L,Duvall W I.Rock Mechanics and the Design of Structures in Rock[M].Hoboken:Wiley,1967.
[8]王洪求,闫国亮,谢春辉,等.一种新的岩石脆性评价参数及其在致密油储层预测中的应用[C]//2015年物探技术研讨会论文集.武汉:石油地球物理勘探学会,2015:57-61.Wang H Q,Yan G L,Xie C H,et al.A new evaluation parameter for brittleness index and its application in tight oil reservoir forecasting[C]//2015 Annual Conference of Geophysical Exploration Technology.Wuhan:Oil Geophysical Prospecting,2015:57-61.(in Chinese)
[9]徐蕾,师永民,徐常胜,等.长石族矿物对致密油储渗条件的影响以鄂尔多斯盆地长6油层组为例[J].石油勘探与开发,2013,40(4):448-454.Xu L,Shi Y M,Xu C S,et al.Influences of feldspars on the storage and permeability conditions in tight oil reservoirs:A case study of Chang-6Oil Layer Group,Ordos Basin[J].Petroleum Exploration and Development,2013,40(4):448-454.(in Chinese)
[10]赵向原,曾联波,王哓东,等.鄂尔多斯盆地宁县-合水地区长6、长7、长8储层裂缝差异性及开发意义[J].地质科学,2015,50(1):274-285.Zhao X Y,Zeng L B,Wang X D,et al.Differences of natural fracture characteristics and their development significance in Chang 6,Chang 7and Chang 8reservoir,Ningxian-Heshui area,Ordos Basin[J].Chinese Journal of Geology,2015,50(1):274-285.(in Chinese)
[11]王晓东,祖克威,李向平,等.宁合地区长7致密储集层天然裂缝发育特征[J].新疆石油地质,2013,34(4):394-397.Wang X D,Zu K W,Li X P,et al.The characteristics of natural fractures in tight sandstone reservoirs of Chang-7 Member in Ningxian-Heshui Area,Ordos Basin[J].Xinjiang Petroleum Geology,2013,34(4):394-397.(in Chinese)
[12]弓浩浩,夏宏泉,杨双定.姬塬地区岩石脆性实验及压裂缝高缝宽预测研究[J].国外测井技术,2013,149(2):57-61.Gong H H,Xia H Q,Yang S D.Rock brittleness test and forecasting of fracture height and width in Jiyuan area[J].World Well Logging Technology,2013,149(2):57-61.(in Chinese)
[13]南珺祥,王素荣,姚卫华,等.鄂尔多斯盆地陇东地区延长组长6-8特低渗透储层微裂缝研究[J].岩性油气藏,2007,19(4):40-44.Nan J X,Wang S R,Yao W H,et al.Microfractures in extra-low permeability reservoir of Yanchang Formation in Ordos Basin[J].Lithologic Reservoirs,2007,19(4):40-44.(in Chinese)
[14]李进步,卢双舫,陈国辉,等.基于矿物学和岩石力学的泥页岩储层可压裂性评价[J].大庆石油地质与开发,2015,34(6):159-164.Li J B,Lu S F,Chen G H,et al.Friability evaluation for the mud shale reservoirs based on the mineralogy and rock mechanics[J].Petroleum Geology and Oilfield Development in Daqing,2015,34(6):159-164.(in Chinese)
[15]杜保健,程林松,曹仁义,等.致密油藏体积压裂水平井开发效果[J].大庆石油地质与开发,2014,33(1):96-101.Du B J,Cheng L S,Cao R Y,et al.Development effects of the volumetric fracturing horizontal well in tight oil reservoirs[J].Petroleum Geology and Oilfield Development in Daqing,2014,33(1):96-101.(in Chinese)
[16]王欢,廖新维,赵晓亮,等.非常规油气藏储层体积改造模拟技术研究进展[J].特种油气藏,2014,22(2):8-15.Wang H,Liao X W,Zhao X L,et al.The progress of reservoir stimulation simulation technology in unconventional oil and gas reservoir[J].Special Oil&Gas Reservoirs,2014,22(2):8-15.(in Chinese)
[17]杨俊峰,芮捍东,田建波,等.致密油藏多段压裂水平井初始产能影响因素分析[J].石油地质与工程,2014,28(6):65-68.Yang J F,Rui H D,Tian J B,et al.Influencing factors analysis of multi-stage fractured horizontal wells'initial productivity in dense reservoirs[J].Petroleum Geology and Engineering,2014,28(6):65-68.(in Chinese)