天然气地球科学 ›› 2021, Vol. 32 ›› Issue (5): 623–632.doi: 10.11764/j.issn.1672-1926.2020.12.004

• 天然气地质学 •    下一篇

渤海湾盆地冀中坳陷束鹿凹陷中深层湖相碳酸盐岩致密储层天然气成藏条件与资源潜力

张锐锋1(),陈柯童2,朱洁琼1,3,唐玄4,鱼占文2,张宇飞2,赵旭2,江涛2   

  1. 1.中国石油华北油田公司,河北 任丘 062552
    2.中国石油华北油田公司勘探开发研究院,河北 任丘 062552
    3.南方石油勘探开发有限责任公司勘探开发研究中心,海南 海口 570216
    4.中国地质大学(北京)页岩气勘查与评价国土资源部重点实验室,北京 100083
  • 收稿日期:2020-10-20 修回日期:2020-12-03 出版日期:2021-05-10 发布日期:2021-04-27
  • 作者简介:张锐锋(1964-),男,山西寿阳人,教授级高级工程师,博士,主要从事地质勘探研究.E-mail:ktb_zrf@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项“冀中坳陷增储领域地质评价与勘探实践”(2016ZX05006-005-003);中国石油科技创新基金项目“湖相碳酸盐岩富有机质层内油气运移与可动性研究”(2016D-5007-0106);国家科技重大专项“华北探区致密油资源潜力、甜点区预测与关键技术应用”(2016ZX05046-006-007)

Tight gas reservoir forming condition and resource potential in the lacustrine carbonate in the middle-deep layer of Shulu Sag of Jizhong Depression, Bohai Bay Basin

Rui-feng ZHANG1(),Ke-tong CHEN2,Jie-qiong ZHU1,3,Xuan TANG4,Zhan-wen YU2,Yu-fei ZHANG2,Xu ZHAO2,Tao JIANG2   

  1. 1.PetroChina Huabei Oilfield Company,Renqiu 062552,China
    2.Exploration and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China
    3.Exploration and Development Research Center of PetroChina Southern Petroleum Exploration and Development Co. Ltd. ,Haikou 570216,China
    4.Key Laboratory of Shale Gas Exploration and Evaluation,Ministry of Land and Resources,China University of Geosciences,Beijing 100083,China
  • Received:2020-10-20 Revised:2020-12-03 Online:2021-05-10 Published:2021-04-27
  • Supported by:
    The China National Science & Technology Major Project(2016ZX05006-005-003);the Science and Technology Innovation Fund Project of CNPC(2016D-5007-0106)

摘要:

传统认为渤海湾盆地冀中坳陷束鹿凹陷沙三下亚段是主要烃源岩层系,以生油为主。华北油田的勘探实践发现中深层砾岩—泥灰岩致密储层具有较大的天然气资源潜力,这为渤海湾盆地富油凹陷寻找天然气提供了新领域和新方向。研究发现,束鹿凹陷沙三下亚段发育有砾岩、泥灰岩和(灰质)泥岩等多种岩性,均具有生烃能力,其中纹层状泥灰岩生烃能力最强,主要分布在中部洼槽区层序二—层序三;中深层储层,为特低孔特低渗储层,物性不受埋深控制。束鹿凹陷内纵、横向油气藏性质和分布受控于烃源岩热演化程度,由浅到深形成致密油带、油气共生带、纯气带递次变化的“致密油、气连续成藏序列”。利用体积法和资源丰度类比法预测束鹿凹陷中深层天然气资源量为672.1×108 m3,并指出中部洼槽区晋古11井区是中深层天然气勘探的有利现实方向。

关键词: 束鹿凹陷, 砾岩—泥灰岩, 致密气, 沙三下亚段, 勘探潜力

Abstract:

The lower third member of Shahejie Formation (Es3) was traditionally considered as the main source rock for oilfields in Shulu Sag, Bohai Bay Basin. The exploration practice of Huabei Oilfield Company showed the middle-deep conglomerate-marl lacustrine carbonate tight reservoirs have great potential of natural gas resources, which provides a new field and direction for exploration of natural gas in the oil-rich Bohai Bay Basin. There are conglomerate, marl and (calcareous) mudstone and other lithology developed in the lower Es3 of Shulu Sag, and all of them have hydrocarbon generation potential, among which the laminar marls have the highest hydrocarbon generation ability and they are mainly distributed in sequences 2 to 3 in the central depression; the middle-deep reservoirs have extremely low porosity and ultra-low permeability, and their physical properties are not controlled by burial depth. The vertical and horizontal distribution of hydrocarbon reservoirs and their fluid properties in the sag are controlled by the thermal evolution degree of hydrocarbon source rock by hydrous pyrolysis experiments and exploration data. There is a successive change from tight oil to tight gas accumulation sequence from shallow to deep, including tight oil belt, oil-gas paragenesis zone and pure gas zone. The volume method and resource abundance analogy method are used to predict the natural gas resources of 672.1×108 m3 in Shulu Sag, and it is pointed out that the Jingu 11 well area in the central depression area is a favorable practical direction for the exploration of middle and deep natural gas.

Key words: Shulu Sag, Conglomerates-marls, Tight gas, Lower Es3, Exploration potential

中图分类号: 

  • TE122

图1

束鹿凹陷构造和井位分布"

图2

束鹿凹陷沙三下亚段层序划分及连井对比(连井位置见图1)"

图3

束鹿凹陷沙三下亚段不同岩性与平均TOC关系"

图4

束鹿凹陷有机质热演化程度与含油饱和度指数OSI关系"

图5

束鹿凹陷沙三下亚段致密储层岩心和荧光薄片含油特征(a)束探3井,3 671.5 m,泥灰岩层理面含油;(b)束探1H井,4 206.6 m,纹层状泥灰岩,层理缝含油,荧光;(c)晋98X井,4 006.4 m,颗粒支撑陆源砾岩,白云石晶间孔含油,荧光;(d)束探3井,4 264.7 m,砾岩裂缝含油;(e)晋94X井,3 543.2 m,颗粒支撑陆源砾岩,颗粒边缘溶蚀缝含油,荧光;(f)束探1H井,4 035.6 m,颗粒支撑陆源砾石,白云石晶间溶蚀孔含油,荧光"

图6

束探3井岩石密度、孔隙度和渗透率与深度关系(洗油后)"

表1

束鹿凹陷试油层段原油性质和天然气组分"

井号取样井段/m垂深/m原油分析结果
密度/(g/cm3)20 ℃黏度/(mPa·s)凝固点/℃含蜡/%含硫/%沥青质胶质/%
束探1H4 832.768~4 973.04 580~4 6500.8294.4333322.950.187.25
束探1H4 832.768~4 973.04 580~4 6500.8314.6273520.90.198.05
束探1H4 832.768~4 973.04 580~4 650//////
束探1H4 620~4 953.1814 462.7~4 636.50.826 34.0953318.870.168.5
束探1H4 620~4 953.1814 462.7~4 636.50.826 83.9193324.20.156.4
束探1H4 620~4 953.1814 462.7~4 636.5//////
束探2X3 685.00~4 947.2753 632~4 000//////
束探2X3 685.00~4 947.2753 632~4 0000.895 816.044020.050.7925.95
束探2X3 685.00~4 947.2753 632~4 0000.874 416.043521.50.5730.05
束探2X3 685.2~4 947.2753 632.14~4 0000.872 410.753415.30.4823.55
束探2X3 685.2~4 947.2753 632.14~4 000//////
束探2X3 685.2~4 947.2753 632.14~4 000//////
束探34 057.0~4 321.04 057.0~4 321.00.878 411.963115.450.5221.2
束探34 057.0~4 321.04 057.0~4 321.00.892 430.913615.150.4922.45
束探34 057.0~4 321.04 057.0~4 321.00.892 430.913615.150.4922.45
束探34 057.0~4 321.04 057.0~4 321.0//////
束探34 057.0~4 321.04 057.0~4 321.0//////

图7

晋100井样品生排烃模拟产气量随温度变化趋势"

图8

束鹿凹陷致密油气成藏模式"

图9

束鹿凹陷中南部沙三下亚段致密油气有利区带分布"

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