| 页岩岩相分类表征及对建产区产能的影响 |
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| 引用本文： | 欧成华,梁成钢,罗利,杨晓,李丹,李兆亮.页岩岩相分类表征及对建产区产能的影响[J].沉积学报,2021,39(2):269-280. |
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| 作者姓名： | 欧成华 梁成钢 罗利 杨晓 李丹 李兆亮 |
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| 作者单位： | 西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500;西南石油大学石油与天然气工程学院,成都 610500;中国石油新疆油田分公司吉庆油田作业区,新疆吉木萨尔 831700;中国石油集团测井有限公司西南分公司,重庆 400021;东方地球物理勘探有限责任公司西南物探研究院,成都 610213;西南石油大学石油与天然气工程学院,成都 610500;中国石油青海油田分公司勘探开发研究院,甘肃敦煌 736202 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目;国家科技重大专项;四川省科技计划 |
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| 摘 要： | 单井产气能力差异大，导致持续稳产困难是页岩气建产区面临的关键难题。围绕页岩气建产区特点，建立了考虑建产区产气能力影响的优质海相页岩岩相分类表征技术流程。首先，分析了建产区优质页岩产气能力差异主控因素，制定了建产区优质页岩岩相分类方案；然后，建立了TOC含量，孔隙度，泥质、硅质、钙质矿物含量等关键参数测井计算模型，结合页岩成因类型，完成了建产区单井参数计算及岩相识别，在实例页岩气建产区识别出10类页岩岩相，揭示了页岩岩相类型与产气能力差异间的对应关系；最后，采用沉积微相约束岩相的策略，运用截断高斯模拟算法建立起实例页岩气建产区岩相三维模型，展示了每类岩相的空间分布特征，揭示了区内五峰组—龙马溪组海相黑色页岩内部产气能力差异特征，与此同时，按照满足在三维空间中所占体积比例大、产气能力大的条件，确定区内产气能力最优的岩相类型为:富碳高孔含钙泥质硅质页岩、富碳富孔混合页岩和高碳中—高孔含钙含泥硅质页岩。上述成果有利于解释建产区不同空间位置产气能力存在较大差异的本质原因，为页岩气建产区精细化生产管理提供技术支撑。
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| 关 键 词： | 页岩气建产区 优质海相页岩 岩相分类表征 三维可视化建模 产能差异 |
| 收稿时间： | 2020-05-28 |
The Lithofacies Classification and Its Influence on the Gas Production Capacity in the Shale Gas Production Area |
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| OU ChengHua,LIANG ChengGang,LUO Li,YANG Xiao,LI Dan,LI ZhaoLiang.The Lithofacies Classification and Its Influence on the Gas Production Capacity in the Shale Gas Production Area[J].Acta Sedimentologica Sinica,2021,39(2):269-280. |
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| Authors: | OU ChengHua LIANG ChengGang LUO Li YANG Xiao LI Dan LI ZhaoLiang |
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| Institution: | (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China;Jiqing Oil Production Plant,Xinjiang Oilfield Branch,CNPC,Jimusaer,Xinjiang 831700,China;Southwest Branch,China Petroleum Logging Co.,Ltd.,Chongqing 400021,China;Southwest Geophysical Exploration Institute of Oriental Geophysical Exploration Co.,Ltd.,Chengdu 610213,China;Exploration and Development Institute,Qinghai Oilfield Branch,CNPC,Dunhuang,Gansu 736202,China) |
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| Abstract: | The gas production capacity difference among single wells and the difficulties in sustaining stable production are the key problems faced by shale gas production areas.Based on the typical characteristics of the shale gas production areas,a technical process for the lithofacies classification of high-quality marine shale affected by the gas production capacity was established in this paper.Firstly,for the high-quality marine shale in the shale gas production area,the main gas production capacity difference control factors were analyzed,and the lithofacies classification scheme was determined.Then,using the developed logging calculation model of total organic carbon(TOC)content,porosity,clay,siliceous,and calcareous mineral content,the single well parameter calculation and the lithofacies identification in one shale gas producing area were completed.A total of 10 types of shale lithofacies were identified in one shale gas production area,and the relationship between shale lithofacies type and gas production capacity difference was revealed by comparing the gas content of each lithofacies.Finally,a three-dimensional(3D)lithofacies model in one shale gas production area was established by using the truncated Gaussian simulation algorithm and the sedimentary microfacies confined lithofacies strategies,the spatial distribution characteristics of each kind of lithofacies were shown,and the gas production capacity difference in the Wufeng-Longmaxi black shale in the study area was revealed.At the same time,according to the two conditions of large volume proportion and great gas potential in 3D space,the three different lithofacies with excellent gas production capacity in the study area were determined as i.rich in carbon,high in porosity,calcium,muddy siliceous shale,ii.rich in both carbon and porosity mixed shale,and iii.high in carbon,medium to high in porosity,calcium,muddy siliceous shale.The above results are helpful for explaining the essential causes for the great difference in the decline amplitude and output effect of shale gas production areas,laying a solid theory foundation and technical support for fine production management in shale gas production areas. |
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| Keywords: | shale gas-production area high-quality marine shale lithofacies classification 3D visual modeling production capacity difference |
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