四川盆地复兴地区侏罗系陆相凉高山组页岩油气甜点预测关键技术  

Key technologies for predicting sweet spots of Jurassic Lianggaoshan Formation continental shale oil and gas in the Fuxing area of the Sichuan Basin

作　　者：陈超[1,2] 陈祖庆 刘晓晶[1,2] 印兴耀 石美璟[1,2] 陈琪 周江辉[1,2] CHEN Chao;CHEN Zuqing;LIU Xiaojing;YIN Xingyao;SHI Meijing;CHEN Qi;ZHOU Jianghui(Sinopec Exploration Company,Chengdu,Sichuan 610041,China;State Key Laboratory of Shale Oil&Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China;China University of Petroleum-East China,Qingdao,Shandong 266580,China)

机构地区：[1]中国石化勘探分公司 [2]页岩油气富集机理与高效开发全国重点实验室 [3]中国石油大学(华东)

出　　处：《天然气工业》2025年第1期94-104,共11页Natural Gas Industry

基　　金：国家自然科学基金重点项目“裂缝型储层五维地震解释理论与方法研究”(编号:42030103);中国石化科技部基础研究项目“四川盆地陆相页岩油气甜点地震预测技术研究”(编号:P22159)。

摘　　要：中国页岩油气正处于勘探开发快速发展期,通过近十年快速发展,海相页岩气形成了较为系统的“甜点”地震预测技术,有效支撑了规模效益开发。四川盆地陆相页岩油气是重要的接替和增储上产领域,为了尽快形成一套适用于陆相页岩油气的“甜点”地震预测技术,以四川盆地复兴地区侏罗系凉高山组页岩为例,深入分析凉高山组页岩地质及地球物理特征,提出了具有较强适应性的“甜点”地震预测技术系列。研究结果表明:(1)基于陆相页岩纹层结构发育特征,构建了陆相页岩岩石物理模型,岩心测试与岩石物理模型相结合,明确了各向异性参数是有利岩相的敏感参数,并进一步推导建立了4项式VTI反射系数近似方程,降低了反演维度,提高了各向异性参数的反演稳定性,预测了有利岩相展布;(2)建立了考虑构造宽缓度、变形强弱等因素的压实趋势面,对Eaton法预测结果进行了校正,形成了基于趋势面校正的压力系数预测技术,预测相对误差小于10%;(3)基于全岩X射线衍射以及测井力学参数分析,明确了复兴地区脆性平面变化特征,基于YPD方程开展杨氏模量、泊松比直接反演,实现陆相页岩脆性指数地震预测;(4)针对断裂、褶皱多成因的陆相页岩裂缝发育特征,将地震属性与地质力学裂缝预测技术相融合,形成了多类型多尺度裂缝预测技术。结论认为,将有利岩相、压力系数地质甜点参数、脆性指数和裂缝工程甜点参数融合评价,综合确定了该区的页岩油气甜点区范围,经实钻井验证地震预测结果吻合度较高,研究成果对我国陆相页岩油气勘探开发具有借鉴意义。China's shale oil/gas exploration and development is currently in a rapid growth period.Over the past decade,a set of relatively systematic sweet spot seismic prediction technologies have been formed as an effective support to the large-scale and beneficial development of marine shale gas.The continental shale oil/gas in the Sichuan Basin represent an important replacement of resources.To figure out a set of sweet spot seismic prediction technologies suitable for continental shale oil/gas,the geological and geophysical characteristics of the Lianggaoshan Formation shale in the Fuxing area of the Sichuan Basin were analyzed,and then a series of targeted sweet spot seismic prediction technologies were proposed.The following results are obtained.First,a petrophysical model of continental shale is established based on the development characteristics of laminated textures in continental shale.By combining core test with petrophysical model,it is determined that favorable lithofacies is sensitive to anisotropy parameters.In addition,a four-term approximate equation of VTI reflection coefficient is derived.Thus,the inversion dimension is reduced,the inversion stability of anisotropy parameters is improved,and the distribution of the favorable lithofacies is predicted.Second,a compaction trend surface including the factors such as structure width,steepness and deformation intensity is established,the prediction results by the Eaton method are corrected,and a pressure coefficient prediction technology based on trend surface correction is developed,with the relative error lower than 10%.Third,the planar variation of the brittleness in the Fuxing area is clarified through bulk-rock XRD and logging mechanical parameter analysis.The seismic prediction of continental shale brittleness index is realized by direct inversion of Young's modulus and Poisson's ratio based on YPD equation.Fourth,considering the fracture development characteristics in the continental shale with multiple origins of fracture and fold,the seismic attribu

关 键 词：四川盆地 复兴地区 凉高山组 陆相页岩油气 有利岩相 VTI各向异性 脆性指数 甜点 

分 类 号：TE122[石油与天然气工程—油气勘探]