岩性油气藏 ›› 2026, Vol. 38 ›› Issue (4): 1–11.doi: 10.12108/yxyqc.20260401

• 地质勘探 • 上一篇    下一篇

柴北缘侏罗系—古近系天然气成藏条件及路探1井的勘探发现

薛建勤1,2,3(), 马峰4(), 龙国徽2,3, 孙秀建4, 王爱萍4, 朱世发1, 武云昭2, 游仁宗2   

  1. 1 中国石油大学（北京） 地球科学学院， 北京 102249
    2 中国石油青海油田公司， 甘肃 敦煌 736202
    3 青海省高原咸化湖盆油气地质重点实验室， 甘肃 敦煌 736202
    4 中国石油勘探开发研究院 西北分院， 兰州 730020
  • 收稿日期:2025-12-31 修回日期:2026-02-12 出版日期:2026-07-01 发布日期:2026-07-06
  • 第一作者:薛建勤（1971—），男，中国石油大学（北京）在读博士研究生，教授级高级工程师，主要从事油气勘探方面的研究工作。地址：（736202）甘肃省敦煌市七里镇青海油田公司一号办公楼。Email:xjqqh@petrochina.com.cn。
  • 通信作者: 马峰

Natural gas accumulation conditions in Jurassic-Paleogene of the northern margin of Qaidam Basin and exploration discovery of well Lutan-1

XUE Jianqin1,2,3(), MA Feng4(), LONG Guohui2,3, SUN Xiujian4, WANG Aiping4, ZHU Shifa1, WU Yunzhao2, YOU Renzong2   

  1. 1 College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    2 PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu， China
    3 Qinghai Provincial Key Laboratory of Plateau Saline-Lacustrine Basinal Oil & Gas Geology, Dunhuang 736202, Gansu， China
    4 Research Institute of Petroleum Exploration & Development-Northwest （NWGI）, PetroChina， Lanzhou 730020, China
  • Received:2025-12-31 Revised:2026-02-12 Online:2026-07-01 Published:2026-07-06
  • Contact: MA Feng E-mail:xjqqh@petrochina.com.cn;mafeng@petrochina.com.cn

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摘要：

柴北缘近期部署的路探1井在侏罗系大煤沟组砂岩与古近系路乐河组连续获得突破，显示该区斜坡-凹陷带岩性气藏的勘探潜力巨大。基于全油气系统成藏理论，系统剖析了该区天然气成藏的地质条件与主控因素，并明确了下步勘探方向。研究结果表明：①伊北凹陷等主力生烃凹陷保存完整，侏罗系煤系气源岩分布广、厚度大、成熟度高，为天然气成藏提供了充足的气源。②古近系路乐河组—侏罗系大煤沟组受古沟槽-坡折地貌控制，斜坡区发育大面积砂岩储层，形成了富砂带；路乐河组泥岩与侏罗系大煤沟组泥岩为高效区域盖层，古近系底界区域不整合面为关键油气运移通道，共同控制了稳定斜坡区砂岩连续成藏；路探1井的突破，实现了该区勘探思路从隆起向斜坡-凹陷的转型，证实了“不整合面网输导、近源高效充注、优质盖层封闭、古地貌控砂富集”的成藏模式，有助于柴北缘煤系全油气系统的勘探和研究。③依据“下坡下凹近源找气”的新勘探思路，伊北凹陷周缘四大古斜坡带具有较大的勘探潜力，可能是未来规模增储的核心领域。

关键词: 岩性气藏, 煤系气, 古地貌, 斜坡-凹陷区, 近源成藏, 路乐河组, 大煤沟组, 侏罗系, 路探1井, 柴北缘

Abstract:

Recent deployed well Lutan-1 in the northern margin of Qaidam Basin has achieved successive breakthroughs in Jurassic Dameigou Formation sandstone and Paleogene Lulehe Formation, revealing significant exploration potential for lithologic gas reservoirs in the slope-sag belt of this region. Based on the whole petroleum system accumulation theory, geological conditions and main controlling factors of natural gas accumulation were systematically analyzed, and the direction for further exploration was clarified. The results show that: (1) Major hydrocarbon-generating sags such as Yibei Sag are well preserved, and Jurassic coal-measure source rocks widely distributed, with large thickness and high maturity, providing abundant gas sources for natural gas accumulation. (2) Controlled by paleo-gully and slope-break geomorphology, Paleogene Lulehe Formation and Jurassic Dameigou Formation developed large area sandstone reservoirs in the slope zone, forming sand-rich belts. Lulehe Formation mudstone and Jurassic Dameigou Formation mudstone are efficient regional caprocks, while the regional unconformity at Paleogene base serves as a key migration pathway, jointly controlling the continuous accumulation of sandstone reservoirs in the stable slope. The breakthrough of well Lutan-1 marks a shift in exploration strategy from uplift to slope-sag zones in this area, confirming the accumulation model of “unconformity network migration, near-source efficient charging, high-quality caprock sealing, and paleo-geomorphology controlling sandstone enrichment”， which is conducive to the exploration and study of the whole petroleum system for coal-measure gas in the northern margin of Qaidam Basin. （3） According to the new exploration concept of “moving down slope and into sags, searching for gas near sources”, four major paleo-slope zones on the periphery of Yibei Sag have great exploration potential and may be the key areas for future large-scale reserves expansion.

Key words: lithologic gas reservoir, coal-measure gas, paleogeomorphology, slope-sag zone, near source accumulation, Lulehe Formation, Dameigou Formation, Jurassic, well Lutan-1, northern margin of Qaidam Basin

中图分类号: 

  • TE122.12

图1

柴北缘构造带划分(a)及侏罗系—古近系岩性地层综合柱状图(b)"

图2

柴北缘侏罗系烃源岩分布图"

表1

柴北缘伊北凹陷侏罗系主力烃源岩特征"

层位 岩性 厚度/m 分布面积/km² TOC/
%		 生烃潜量/(mg·g-1) 评价
小煤沟组
(J1x)		 湖沼相炭质
泥岩、含煤		 320 5 308.00 2.70~21.20 9.30~81.30 主力气源岩
湖西山组二段(J1h2) 湖相暗色
泥岩		 480 10 116.00 0.51~6.00 0.49~27.90 好—优
质气源岩
湖西山组一段(J1h1) 湖沼相薄煤
层、炭质泥岩		 350 8 673.00 > 40.00 102.00~175.00 优质气源岩

图3

柴北缘侏罗系烃源岩成熟度与埋深关系"

图4

柴北缘路深1井侏罗系大煤沟组储层物性特征"

图5

柴北缘马仙地区古近系路乐河组底部Ⅳ砂组古地貌与侏罗系厚度叠合图"

表2

柴北缘路探1井古近系路乐河组—侏罗系主要储盖组合特征"

层系 储-盖组合 岩性特征 地震响应特征 试气情况
古近系
路乐河组		 第一套 盖层 辫状河三角洲平原亚相泛滥平原泥岩、砂质泥岩，厚度为8~12 m 中等振幅，连续波峰反射 4 484.0~4 504.0 m，8 mm
油嘴，4 097.0~16 834.0 m3/d
储层 辫状河三角洲平原分流河道砂体，孔隙度为6.00%~19.20%，渗透率为0.30~10.00 mD，厚度为5~20 m 中强振幅，连续波谷反射
第二套 盖层 辫状河三角洲平原亚相泛滥平原泥岩、砂质泥岩，
厚度为6~10 m		 中强振幅，连续波峰反射 显示良好
储层 辫状河三角洲平原分流河道砂体厚度为4~15 m 中强振幅，连续波谷反射
侏罗系 第一套 盖层 扇三角洲平原泛滥平原泥岩，厚度为78m 中强振幅，2套波峰 +
波谷反射		 4 842.0~4 850.0 m，5 mm
油嘴，稳定60 635.0 m3/d
储层 扇三角洲平原分流河道砂体，孔隙度为1.74%~9.70%，渗透率为0.10~5.90 mD，厚度为5~40 m 中弱振幅，不连续2套波峰 + 波谷反射
第二套 储-盖 扇三角洲平原分流河道砂体与泛滥平原泥岩互层；盖层单层厚度为2~8 m，储层单层厚度为3~16 m 中弱振幅，1套波峰 +
波谷反射		 显示良好

图6

柴北缘马仙地区天然气运移模式图（剖面位置见图1a）"

图7

柴北缘路探1井随钻综合柱状图及现场测试照片"

图8

柴北缘路探1井埋藏-热演化史"

图9

柴北缘马仙斜坡区古近系路乐河组—侏罗系成藏模式图（剖面位置见图1a）"

图10

柴北缘关键成藏期侏罗系古构造图"

图11

柴北缘路探1井—T3井成藏剖面图（剖面位置见图1a）"

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