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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (12): 1771-1784.doi: 10.11764/j.issn.1672-1926.2021.06.005

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Research on evaluation method of movable hydrocarbon resources of shale oil in the Chang 73 sub-member in the Ordos Basin

Shixiang LI1,2(),Xinping ZHOU1,2(),Qiheng GUO1,2,Jianping LIU1,3,Jiangyan LIU1,2,Shutong LI4,5,Bo WANG1,2,Qiqi LÜ6   

  1. 1.National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields，Xi’an 710018，China
    2.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company，Xi'an 710018，China
    3.Branch Exploration Department of PetroChina Changqing Oilfield Company，Xi'an 710018，China
    4.Northwest Institute of Eco?Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
    5.Key Laboratory of Petroleum Resources，Gansu Province，Lanzhou 730000，China
    6.Geosciences School of Yangtze University，Wuhan 430100，China
  • Received:2021-03-12 Revised:2021-06-22 Online:2021-12-10 Published:2021-12-27
  • Contact: Xinping ZHOU E-mail:sxlee1981_cq@petrochina.com.cn;zhxp13_cq@petrochina.com.cn
  • Supported by:
    The National Natural Science Foundation of China(42102170);the China National Science & Technology Major Project(2017ZX05001002)

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Abstract:

A set of fine-grained sediments of organic-rich shale interbedded with thin layer silt and fine grained sandstones developed in the Chang 73 sub-member of the Ordos Basin. It has the characteristics of overall hydrocarbon generation and general oil-bearing. It is of great significance to clarify the hydrocarbon content， occurrence state and hydrocarbon components of different types of fine-grained sediments for the potential analysis and sweet spot selection of this type of shale oil resources. This study is based on the systemical core testing and analysis of the Chang 73 sub-member of Well CY1， movable hydrocarbon research on four fine-grained sedimentary rock types is carried out， including black shale， dark mudstone， siltstone and fine-grained sandstone， by using multi-granular multi-polar sequential extraction methods， and the movable hydrocarbon resources of shale oil in the Chang 73 sub-member is evaluated in the Ordos Basin. The research results show that the hydrocarbon content and its components of different types of fine-grained sediments under different particle size crushing conditions（1 cm3，0.5 cm3，150 mesh） are analyzed by multi-particle multi-polar sequential extraction. The unit extraction amount of hydrocarbon is fine-grained sandstone>black shale>siltstone>dark mudstone. The soluble organic matter extracted by step 1 and step 2 is mainly light-medium components and belongs to movable hydrocarbons. Soluble organic matter extracted by steps 3 and 4 is immobile hydrocarbon. Based on the above test methods， the movable hydrocarbon of black shale， dark mudstone， siltstone and fine sandstone in the Chang 73 sub-member are 3.35 mg/g， 1.45 mg/g， 3.28 mg/g and 4.48 mg/g， respectively. The movable hydrocarbon resources of 220 km2 shale oil in Cheng 80 well block in the Chang 73 sub-member were evaluated. The preliminary evaluation results were （0.37-0.51）×108 t. The distribution area of shale oil in the Chang 73 sub-member in the Ordos Basin is about 1.5×104 km2. Through analogy analysis， it is estimated that its movable hydrocarbon resources are （25-35）×108 t. This type of shale oil is expected to become a new replacement area for oil exploration in the basin.

Key words: Ordos Basin, Chang 73 sub-member shale oil, Movable hydrocarbons, Multi-grain and multi-polar extraction

CLC Number: 

  • TE122.2

Fig.1

Sample depth information of multi-granularity and multi-polar extraction"

Fig.2

TOC content of experimental samples from Well CY1"

Fig.3

Relative mineral content of experimental samples from Well CY1"

Table 1

Multi-granularity and multi-polarity extraction simulation experimental conditions and results"

样品基本信息实验条件实验结果
岩性深度 /m

抽提

顺序

样品形式溶剂系统溶剂用量 /（mL/g）

抽提

方式

抽提次数 /次

单步抽提量

/（mg/g）

抽提率

/%

总抽提次数 /次抽提总量 /（mg/g）

轻烃恢复量

/（mg/g）

可动烃 /（mg/g）不可动烃 /（mg/g）

黑色

页岩

2 025.02步骤1块状1 cm3

二氯甲烷/甲醇

（93∶7）

0.4

超

声

冷

抽

提

171.758 835755.0380.7363.351 92.421 8
步骤2块状0.5 cm3160.857 117
步骤3150目粉末状260.993 520
步骤4

四氢呋喃/丙酮/甲醇

（50∶25∶25）

0.15161.428 328

暗色

泥岩

2 021.95步骤1块状1 cm3

二氯甲烷/甲醇

（93∶7）

0.490.199 810582.0780.3031.453 52.461 2
步骤2块状0.5 cm390.449 822
步骤3150目粉末状260.979 647
步骤4

四氢呋喃/丙酮/甲醇

（50∶25∶25）

0.15140.449 222
粉砂岩2 051.36步骤1块状1 cm3

二氯甲烷/甲醇

（93∶7）

0.4181.701 548533.549 80.5183.283 10.784 1
步骤2块状0.5 cm3141.063 630
步骤3150目粉末状220.358 110
步骤4

四氢呋喃/丙酮/甲醇

（50∶25∶25）

0.15140.426 012
细砂岩2 031.48步骤1块状1 cm3

二氯甲烷/甲醇

（93∶7）

0.4143.104 270604.313 70.6304.483 10.597 1
步骤2块状0.5 cm3160.748 917
步骤3150目粉末状160.203 14
步骤4

四氢呋喃/丙酮/甲醇

（50∶25∶25）

0.15140.394 09

Fig.4

Flow chart of simulation experiment of multi-granularity and multi-polar extraction"

Fig.5

Single-step extraction rate and cumulative extraction ratio of different lithologic samples in the Chang 73 sub-member"

Fig.6

Comparison of total hydrocarbon chromatograms of step-by-step extracts from dark mudstone of Chang 73 sub-member in 2 021.95 m of Well CY1"

Fig.7

Comparison of total hydrocarbon chromatograms of step-by-step extracts from black shale of Chang 73 sub-member in 2 025.02 m of Well CY1"

Fig.8

Comparison of total hydrocarbon chromatograms of step-by-step extracts from fine sandstone of Chang 73 sub-member in 2 031.48 m of Well CY1"

Fig.9

Comparison of total hydrocarbon chromatograms of step-by-step extracts from siltstone of Chang 73 sub-member in 2 051.36 m of Well CY1"

Table 2

Movable hydrocarbon resources of Chang 73 sub-member shale oil in Cheng 80 well block in the middle of the lake basin"

岩石类型总体积/（108 m3）岩石密度/（t/m3）平均可动烃含量/（mg/g3）页岩油可动烃资源量/（108 t）
合计（0.37~0.51）×108 t
黑色页岩122.23.350.09
暗色泥岩212.41.450.07
粉砂岩体积法估算可动烃资源量（0.13~0.18）×108 t
细砂岩体积法估算可动烃资源量（0.08~0.12）×108 t
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