威远龙马溪组黑色页岩非均质性及对开发的影响  

Heterogeneity of Black Shale of Longmaxi Formation in Weiyuan and Its Impact on Development

作　　者：葛忠伟 樊莉 钟文俊[1] 周静[1] 张南希 王同 Ge Zhongwei;Fan Li;Zhong Wenjun;Zhou Jing;Zhang Nanxi;Wang Tong(Exploration and Development Research Institute,Sinopec SouthwestOil and Gas Field Company,Chengdu,SiChuan 610041,China;West Sichuan Drilling Company,PetroChina ChuanQing Drilling Engineering Co.,Ltd.,Chengdu,SiChuan 610051,China)

机构地区：[1]中石化西南油气分公司勘探开发研究院,四川成都610041 [2]中国石油川庆钻探工程有限公司川西钻探公司,四川成都610051

出　　处：《非常规油气》2019年第4期33-39,共7页Unconventional Oil & Gas

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2017ZX05036003)资助

摘　　要：中石化威远页岩气区块龙马溪组底部黑色优质页岩发育,储量规模大,但储层纵横向表现出较强的非均质性,寻找和落实优质“甜点”储层,是效益开发的地质基础。本文在龙马溪组底部黑色页岩高伽玛段小层精细划分的基础上,通过层间地质及工程特征的纵向对比分析表明:①高伽玛段Ⅱ小层和Ⅱ-Ⅲ小层储层品质最优,为“地质+工程”双甜点层;②页岩储层非均质性对开发的影响主要体现在水平井靶窗的选择尽量要求在“甜点”层内,其直接影响压裂改造的难易程度和有效改造的体积;③钻井证实水平井靶窗位置选择在龙马溪组底部伽玛2-3号峰以及优质储层钻遇率达到90%以上是获得高产的关键地质因素。最后明确了威远地区页岩气水平井以高伽玛段Ⅱ小层和Ⅱ-Ⅲ小层(对应伽玛2-3号峰)为最优靶窗,研究成果支撑了该区页岩气井产能评价、商业产能突破以及水平井钻井。The black high-quality shale in the bottom of Longmaxi Formation in Weiyuan shale gas block of Sinopec is well developed and has large reserves,but the reservoir shows strong heterogeneity both vertically and horizontally.Based on the fine division of the high gamma section of the black shale at the bottom of the Longmaxi Formation,the longitudinal correlation analysis of the geological and engineering characteristics between the layers shows:①The high-gamma sectionⅡandⅡ-Ⅲis the best quality layers,which is the"geological&engineering"double sweet layer.②The influence of shale reservoir heterogeneity on development is mainly manifested in the selection of horizontal well target window,the difficulty of fracturing reconstruction and the effective volume fracturing scale.③Drilling proves that target window position of horizontal well and drilling rate of high quality reservoir in high-gamma section are key geological factors for high yield.Finally,it is clear that theⅡandⅡ-Ⅲlayers of high-gamma formation(corresponding to gamma 2-3 peak)are the optimal target windows for horizontal shale gas wells in Weiyuan area.The research results support the productivity evaluation,commercial productivity breakthrough and horizontal well drilling in this area.

关 键 词：龙马溪组 黑色页岩 非均质性 优质储层 水平井靶窗 

分 类 号：TE122[石油与天然气工程—油气勘探]