随钻地质与地球化学分析在四川威远页岩气开发中的应用

doi:10.3969/j.issn.1672-7703.2021.01.012

摘要/Abstract

摘要： 四川威远是国家级长宁—威远页岩气开发示范工程的重点开发地区，页岩气目的层为下志留统龙马溪组优质页岩发育层段。页岩气水平井钻进过程中，传统的地质录井及随钻测井方法难以对优质页岩气储层进行实时有效的分析与评价，降低了优质储层的钻遇率，增加了钻井施工的风险。通过研究区水平井随钻过程中大量岩屑样品的地质与地球化学录井分析，结合相应取心井分析资料，建立了水平井储层地质评价方法，应用TOC 辅助地层界面卡取，应用TOC、吸附气含量、气测全烃参数评价储层含气性，再结合储层脆性矿物含量进行有利页岩气开发层段评级和优选；同时建立了水平井地质导向辅助方法，通过TOC、Ca 含量、气测全烃等关键参数的相对区间变化，指导工程人员进行水平井着陆入靶调整和水平井窗体控制。现场应用表明，该套技术方法提高了威远地区页岩气水平井开发效率，同时可为同类页岩气储层的有效开发提供技术参考。

关键词: 页岩气, 威远地区, TOC, 储层评价, 地质导向

Abstract: The Weiyuan area of Sichuan province is an important block of the national shale gas development demonstration project
in Changning-Weiyuan. The drilling target layer is the high-quality shale in the Lower Silurian Longmaxi Formation. Traditional
mud logging and logging-while-drilling (LWD) methods have encountered difficulties in effectively analyzing and evaluating
shale gas reservoirs in real time, which has led to the low penetration rate of high-quality reservoirs and increased risk during
drilling operations. This paper sets out geological evaluation methods for shale gas reservoirs in horizontal wells based on geological and geochemical logging analysis of large numbers of cutting samples taken while drilling in combination with lab test
data from offset coring wells. TOC evaluation is used to support thin layer identification. The parameters of TOC, adsorbed gas
content, and total hydrocarbon content from gas logging are applied to evaluate the gas-bearing properties of shale gas reservoirs.
The favorable shale gas reservoirs are ranked and screened by combining these properties with the additional parameter of brittle
mineral content. Auxiliary methods for horizontal well geosteering are also described. By constantly analyzing the relative variation
range of key parameters—TOC, calcium (Ca) content, and total hydrocarbon content—drilling engineers can adjust the horizontal
drilling trajectory in real time to control the horizontal section window and landing target. Field application of these methods
has improved the development efficiency of shale gas horizontal wells in the Weiyuan area. This study therefore provides
technical reference for the efficient development of similar shale gas reservoirs.

中图分类号:

张新新. 随钻地质与地球化学分析在四川威远页岩气开发中的应用[J]. 中国石油勘探, 2021, 26(1): 138-146.

Zhang Xinxin. Application of Geological and Geochemical Analysis While Drilling in shale gas development in the Weiyuan area, Sichuan Basin#br#[J]. China Petroleum Exploration, 2021, 26(1): 138-146.

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