川东北普光地区侏罗系千佛崖组页岩气重大突破

doi:10.3969/j.issn.1672-7703.2022.05.005

摘要/Abstract

摘要： 普光地区首口页岩气专探井普陆页1井在中侏罗统千佛崖组试获日产10.4×10⁴m³的工业气流，取得了川东北千佛崖组页岩气勘探的重大突破。基于泥页岩含气量、地球化学、岩石矿物学、储层特征等分析测试，分析了普陆页1井页岩气成藏条件和富集规律。研究结果表明：（1）普陆页1井千一段3号小层连续发育半深湖相纹层状长英质黏土岩，解析气含量平均为0.58m³/t，总含气量平均为1.58m³/t，TOC平均为1.13%，有机质类型为Ⅱ₁—Ⅱ₂型，R_o平均为2.03%，孔隙度平均为3.8%，是页岩气的“甜点”层段；（2）半深湖—深湖相优质泥页岩是页岩气富集的基础；（3）高成熟—过成熟演化作用使得烃源岩供烃强度大，原油裂解成气可流动性好，形成有机质孔增加泥页岩储集空间和甲烷吸附能力，是普陆页1 井千佛崖组页岩气富集高产的关键条件；（4）高角度裂缝、顺层微裂缝和页理缝密集发育，提高了泥页岩的储集空间和渗流能力，是普陆页1 井千佛崖组页岩气高产的重要条件。上述结果丰富了川东北侏罗系高成熟—过成熟泥页岩的油气藏类型、储集空间特征和富集高产规律等认识，对该区页岩油气勘探具有重要的指导意义。

关键词: 普陆页1井, 页岩气, 千佛崖组, 普光地区, 川东北, 高热演化

Abstract: High gas flow of 10.⁴×10⁴m³/d has been obtained in the first shale gas exploration well Puluye 1 in Puguang area, marking a major breakthrough in shale gas exploration of the Middle Jurassic Qianfoya Formation in the northeastern Sichuan Basin. By using lab test data such as shale gas content, geochemical, petromineralogical, and reservoir characteristics, accumulation conditions and enrichment rule of shale gas in Well Puluye 1 are analyzed. The study results show that: (1) The laminated felsic clay rock of semi-deep lake facies was continuously developed in No. 3 thin layer of the first member of Qianfoya Formation in Well Puluye 1, with the average desorption gas content of 0.58 m³/t, total gas content of 1.58 m³/t, average TOC of 1.13%, Type Ⅱ₁-Ⅱ₂ organic matter, average R_o of 2.03%, and average porosity of 3.8%,which is a sweet spot interval for shale gas exploration; (2) The high-quality shale of semi-deep lake-deep lake is the basis for shale gas enrichment; (3) The key factors for the enrichment and high production of shale gas include high intensity of hydrocarbon supply by the highover mature shale, good fluidity of gas cracked by crude oil, and high reservoir space and methane adsorption capacity of the organic pores;(4) The intensively developed High-angle fractures, bedding micro fractures and cleavage fissures support to increase the reservoir space and permeability of shale, which are important conditions for high shale gas production of Qianfoya Formation in Well Puluye 1. The above results enrich the understanding of oil and gas reservoir types, reservoir space characteristics, enrichment and high production rules of the high-over mature shale in the Jurassic Qianfoya Formation in the northeastern Sichuan Basin, which has important guiding significance for shale oil and gas exploration in the study area.

中图分类号:

TE122.1

王学军, 周勇水, 彭君, 李进, 李红磊, 王亚明, 周凯, 陈帆. 川东北普光地区侏罗系千佛崖组页岩气重大突破[J]. 中国石油勘探, 2022, 27(5): 52-61.

Wang Xuejun, Zhou Yongshui, Peng Jun, Li Jin, Li Honglei, Wang Yaming, Zhou Kai, Chen Fan. Major breakthrough of shale gas in the Jurassic Qianfoya Formation in Puguang area in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2022, 27(5): 52-61.

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