岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 115–126.doi: 10.12108/yxyqc.20250411

• 地质勘探 • 上一篇    

准噶尔盆地东部石钱滩凹陷石炭系石钱滩组烃源岩特征及资源潜力

李振明1,2, 贾存善1,2, 王斌1,2, 宋振响1,2, 邱岐1,2, 王继远1,2, 徐陈杰1,2, 崔钰瑶1,2   

  1. 1. 中国石化石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126;
    2. 中国石化油气成藏重点实验室, 江苏 无锡 214126
  • 收稿日期:2024-09-18 修回日期:2024-12-25 发布日期:2025-07-05
  • 第一作者:李振明（1994-），男，硕士，助理研究员，从事油气成藏与资源评价研究。地址：（214126）江苏省无锡市滨湖区蠡湖大道2060号。Email：lizhm2020.syky@sinopec.com。
  • 基金资助:
    中国石化科技部重大项目“‘十四五’中国石化油气资源评价综合研究”（编号：P23230）和中国石化科技部项目“油气勘查区块分类分级评价与矿权策略研究”（编号：P24235）联合资助。

Characteristics and resource potential of source rocks of Carboniferous Shiqiantan Formation in Shiqiantan Sag，eastern Junggar Basin

LI Zhenming1,2, JIA Cunshan1,2, WANG Bin1,2, SONG Zhenxiang1,2, QIU Qi1,2, WANG Jiyuan1,2, XU Chenjie1,2, CUI Yuyao1,2   

  1. 1. Wuxi Research Institute of Petroleum Geology SINOPEC, Wuxi 214126, Jiangsu, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi 214126, Jiangsu, China
  • Received:2024-09-18 Revised:2024-12-25 Published:2025-07-05

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摘要： 准噶尔盆地东部石钱滩凹陷多口钻井试获工业油气流，展现出良好的勘探潜力。基于全岩有机岩石学特征、热解参数、生物标志化合物特征等，对准噶尔盆地东部石钱滩凹陷石炭系烃源岩有机质类型、丰度、成熟度及沉积环境与母质来源进行了分析，并通过生烃模拟实验对其生烃潜力进行了评价，明确了有效烃源岩发育的控制因素，圈定规模烃源灶的展布范围，并量化其资源规模。研究结果表明：①准噶尔盆地石钱滩凹陷石炭系石钱滩组烃源岩干酪根显微组分以镜质组和惰质组为主，热解参数和稳定碳同位素具有Ⅱ—Ⅲ型特征；有机质丰度较高，热解TOC平均值为2.79%，生烃潜量平均值为0.96 mg/g，Ro为0.70%～1.66%，整体均进入生烃门限，深洼区达到凝析油—湿气阶段；凹陷边缘沉积于弱还原—弱氧化的淡水环境，生烃母质以高等植物为主，而凹陷中心则为还原的偏咸水环境，生烃母质以高等植物及水生生物混合母质输入为主。②受控于原始样品成熟度和品质，半封闭体系下石钱滩组烃源岩烃产率比以往研究成果偏低，结合干酪根生烃理论，认为烃源岩原始生油产率高峰值约150 mg（/g·TOC），原始生气产率高峰值约250 mg（/g·TOC）。③构造活动及沉积背景控制了有效烃源岩的发育及分布，凹陷中心烃源岩厚度可达500 m，TOC可达3.0%。凹陷中心生油强度可达500×104 t/km2或以上，生气强度可达150×108 m3/km2或以上。石钱滩组石油原地资源量约6 600×104 t，天然气原地资源量约730×108 m3，具备形成中型油气田的资源潜力，是准噶尔盆地东部石炭系油气勘探的重要方向和接替领域。

关键词: 烃源岩, 生烃模拟实验, 沉积环境, 构造运动, 母质来源, 生烃潜力, 石钱滩组, 石炭系, 石钱滩凹陷, 准噶尔盆地

Abstract: Several wells in Shiqiantan Sag of eastern Junggar Basin have obtained industrial oil and gas flow， which shows good exploration potential. The organic matter type，abundance，maturity，sedimentary environment and parent material of Carboniferous source rocks in Shiqiantan Sag，eastern Junggar Basin were analyzed based on organic petrology characteristics，pyrolysis parameters，and biomarker characteristics. The hydrocarbon generation potential of Shiqiantan Formation source rocks was evaluated through simulation experiment for hydrocarbon-generating. The controlling factors for the development of effective source rocks were identified， the distribution range of large-scale source stoves was delineated，and the resource quantity was calculated. The results show that： （1）The kerogen macerals of Carboniferous Shiqiantan Formation in Shiqiantan Sag，Junggar Basin are mainly vitrinite and inertinite，and the pyrolysis parameters and stable carbon isotopes have the characteristics of type Ⅱ-Ⅲ. The organic matter abundance is relatively high，with an average pyrolysis TOC value of 2.79%，an average hydrocarbon generation potential value of 0.96 mg/g，and vitrinite reflectance（Ro）ranging from 0.70% to 1.66%，all of them have entered the hydrocarbon generation threshold，and the deep subsag area has reached the stage of condensate oil-wet gas. The edge of the sag is deposited in a weakly reduced to weakly oxidized freshwater environment，and the parent material is mainly composed of higher plants，while the center of the sag is a reduced brackish water environment and the parent material is mainly a mixture of higher plants and aquatic organisms.（2）Controlled by the maturity and quality of the original samples，the hydrocarbon yield ratio of Shiqiantan Formation source rocks in a semi-closed system is relatively lower than previous research results. Combined with the theory of kerogen hydrocarbon generation，it is believed that the peak value of the original oil generation yield of the source rocks is about 150 mg/（g·TOC），and the peak value of the original gas generation yield is about 250 mg/（g·TOC）.（3）The tectonic activity and sedimentary background control the development and distribution of effective source rocks. The thickness of the source rocks in the center of the sag can be 500 m，and the TOC value can be up to 3.0%. The maximum oil generation intensity in the center of the sag can be over 500×104 t/km2，and the maximum gas generation intensity can be over 150×108 m3/km2. There are about 6 600×104t oil resources and 730×108 m3 natural gas resources in place of Shiqiantan Formation，which has the potential to form medium-sized oil and gas fields，and it exhibits target direction and successor field of Carboniferous oil and gas exploration in eastern Junggar Basin.

Key words: source rock, hydrocarbon generation simulation experiment, sedimentary environment, tectonic movement, parent material, hydrocarbon generation potential, Shiqiantan Formation, Carboniferous, Shiqiantan Sag, Junggar Basin

中图分类号: 

  • TE122.1
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