天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 764–774.doi: 10.11764/j.issn.1672-1926.2021.10.010

• 非常规天然气 • 上一篇    下一篇

四川盆地涪陵地区中侏罗统凉高山组陆相页岩油气富集规律探讨

王威(),石文斌,付小平,谢佳彤,倪楷   

  1. 中国石化勘探分公司物探研究院,四川 成都 610041
  • 收稿日期:2021-08-19 修回日期:2021-10-09 出版日期:2022-05-10 发布日期:2022-05-12
  • 作者简介:王威(1980-),男,江苏邳州人,高级工程师,博士,主要从事储层评价与油气成藏研究. E-mail:wangw.ktnf@sinopec.com.
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(2017ZX05036-003)

Oil and gas enrichment regularity of continental shale of Lianggaoshan Formation of Middle Jurassic in Fuling area, Sichuan Basin

Wei WANG(),Wenbin SHI,Xiaoping FU,Jiatong XIE,Kai NI   

  1. Geophysical Research Institute of SINOPEC Exploration Company,Chengdu 610041,China
  • Received:2021-08-19 Revised:2021-10-09 Online:2022-05-10 Published:2022-05-12
  • Supported by:
    The China National Science and Technology Major Project(2017ZX05036-003)

摘要:

为查明四川盆地陆相页岩油气地质特征及富集规律,综合采用全岩矿物X射线衍射、有机地球化学、氩离子抛光—扫描电镜、氦气孔隙度、现场含气量测试及地震压力系数预测等多种技术手段,开展了涪陵地区中侏罗统凉高山组页岩油气藏地质特征及富集高产规律研究,指出凉高山组优质页岩层段具有高泥地比、高GR、高TOC、高含气量的特点,提出涪陵地区凉高山组陆相页岩油气富集高产主要受4个因素的控制:①大面积分布的半深湖相页岩是页岩油气成烃控储的基础;②适当的演化程度控制了陆相页岩油气富集成藏;③良好的保存条件是页岩油气富集成藏的关键;④不同尺度微裂缝的发育有利于陆相页岩油气高产。各影响因素中,保存条件和微裂缝的发育对富集高产的影响最大。

关键词: 涪陵地区, 页岩油气, 陆相, 富集规律

Abstract:

In order to find out the geological characteristics and enrichment law of continental shale oil and gas, the geological characteristics and enrichment law of Lianggaoshan Formation shale oil and gas reservoir in Fuling area were studied by means of whole rock mineral X-ray diffraction, organic geochemistry, argon ion polishing scanning electron microscope, helium porosity, field gas content test and seismic pressure coefficient prediction. It is pointed out that Lianggaoshan Formation shale has the characteristics of high mud to ground ratio, high GR, high TOC and high gas content. It is proposed that the enrichment and high yield of continental shale oil and gas in Fuling area are mainly controlled by four factors: (1) Semi-deep lacustrine shale distributed in large area is the basis of hydrocarbon generation and reservoir control of shale oil and gas; (2) The appropriate degree of evolution controls the enrichment and accumulation of continental shale oil and gas; (3) Good preservation conditions are the key to the enrichment and accumulation of shale oil and gas; (4) The development of micro fractures with different scales is conducive to the high production of continental shale oil and gas. Among the influencing factors, the preservation conditions and the development of microfractures have the greatest impact on enrichment and high yield.

Key words: Fuling area, Shale oil and gas, Continental facies, Enrichment rule

中图分类号: 

  • TE122.2

图1

涪陵地区构造位置"

图2

TY1井凉高山组综合柱状图"

表1

TY1井凉高山组沉积相划分依据"

相带深度/m小层厚度/m泥岩厚度/m泥地比/%GR/APITOC/%含气量/(m3/t)
半深湖2 536.5~2 561.725.224.5397.6104.251.561.81
浅湖2 508.642~2 536.54627.72813.12251.395.261.2350.554
2 561.7~2 584.35422.64213.85761.293.820.750.875
2 584.354~2 598.4414.0512.54967.9698.431.080.5
滨湖2 465.316~2 508.64243.12718.85943.7289.371.530.395
2 598.44~2 624.47226.03212.54848.292.450.4980.304

图3

涪陵地区凉高山组④小层沉积相平面图"

图4

TY1井凉高山组页岩储集空间类型(a)炭质泥岩(全貌),TY1井,2 547.26 m,凉高山组; (b)有机质孔(局部放大),TY1井,2 547.26 m,凉高山组;(c) 黏土矿物孔(局部放大),TY1井,2 547.26 m,凉高山组;(d) 炭质泥岩(全貌),TY1井,2 403.84 m,凉高山组;(e) 粒缘缝,TY1井,2 403.84 m,凉高山组;(f) 微裂缝,TY1井,2 403.84 m,凉高山组"

表2

涪陵地区部分井位储层参数"

井名相带TOC/%厚度/m油气显示/%测井解释孔隙度/%RO/%
TY1半深湖1.5625.21003.521.34
TL2021.05237.423.241.31
TL6011.1123.281.54.281.46
TL2011.8224.722.43.871.3
FY3-2浅湖0.7614.11.42.511.1
FY1滨湖0.776.662.511.03

图5

不同相带页岩厚度、油气显示及TOC对比图"

图6

TY1井页岩TOC与含气量关系"

图7

TY1井地层流体P—T相图"

图8

涪陵地区凉高山组埋藏史"

图9

涪陵地区凉高山组压力系数预测平面图"

图10

涪陵地区凉高山组裂缝分级(a)分期(b)平面图"

表3

四川盆地陆相井位断裂分级、裂缝密度及产量关系"

井号断裂级别裂缝密度/(条/m)测试产量/(104 m3/d)
YN9一级断裂2.870.26
JJ13.66微气
YF10二级断裂1.345.58
PA1三级或四级断裂0.8811.45
TY10.737.8

图11

不同富集因素权重比例"

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