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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (3): 358-368.doi: 10.11764/j.issn.1672-1926.2021.10.014

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Lithologic gas reservoir characteristics and prediction of gas-bearing favorable zone of the Xujiahe Formation in central Sichuan Basin：Case study of the 2nd member of Xujiahe Formation in Anyue-Moxi areas

Xu GUAN1(),Jineng JIN2(),Wei YANG3,Xiaojuan WANG1,Changjiang WU1,Yongling OUYANG2   

  1. 1.Exploration and Development Research Institute of PetroChina Southwest Oil and Gasfield Company，Chengdu 610041，China
    2.School of Earth Science，Yangtze University，Wuhan 430100，China
    3.PetroChina Research Institute of Petroleum Exploration & Development，Beijing 100083，China
  • Received:2021-03-15 Revised:2021-10-20 Online:2022-03-10 Published:2022-03-22
  • Contact: Jineng JIN E-mail:guanxu02@petrochina.com.cn;Jinjineng@yangtzeu.edu.cn
  • Supported by:
    The National Science and Technology Major Projects in the 13th Five Year Plan(2016ZX05047-002)

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Abstract:

To clarify the characteristics and main controlling factors of Xujiahe Formation gas reservoir in central Sichuan Basin， and to guide the prediction of favorable gas bearing areas effectively， this paper takes the 2nd member of Xujiahe Formation in Anyue-Moxi areas as an example. Comprehensive analysis of the gas reservoir characteristics and main controlling factors of the Xujiahe Formation reservoirs have been carried out. An effective geophysical method is used to detect the gas reservoir and predict the gas-bearing favorable zone. The results show that： （1） The 2nd member of Xujiahe Formation in Anyue-Moxi is mainly fracture developed lithologic gas reservoir， with relatively developed low porosity and low permeability pore type or fracture-pore type reservoir. It has favorable source-reservoir-cap combination conditions， and presents the distribution characteristics of large area and overall gas bearing on the plane. （2） The enrichment and high yield of gas reservoirs are mainly affected by source conditions， high-quality reservoirs， local structures and the fault distribution. Gas-bearing favorable areas are centrally controlled by the distribution of high-quality reservoirs and small and medium-sized faults. （3） The distribution of gas-bearing favorable zone can be effectively predicted by the combination of reflection characteristics comparison of near-far traces and dominant amplitude and dominant frequency technology. This method can play a great role for the favorable target exploration of this kind of gas reservoir.

Key words: Central Sichuan Basin, Xujiahe Formation, Lithologic gas reservoir, Gas reservoir characteristics, Gas-bearing zone

CLC Number: 

  • TE121.1+3

Fig.1

Location of study area （modified from Ref.［11］）"

Fig.2

Source rock thickness of Xujiahe Formation in Sichuan Basin"

Table 1

TOC content and RO range distribution of Xujiahe Formation source rocks in central Sichuan Basin"

层段TOC/%RO/%
分布值平均值主体分布值最大值、最小值及均值
须一段0.09~6.161.321.25~1.75

最大：3.9

最小：0.7

均值：1.6

须三段0.06~14.802.40
须五段0.07~7.202.55

Fig.3

Micograph showing thin sections of second member of Xujiahe Formation reservoir in the study area"

Table 2

Reservoir physical properties and test production value of second member of Xujiahe Formation in Anyue gas field"

井位

气层累计厚度

/m

储层孔隙度/%渗透率/（10-3 μm2）

测试日产气量

/（104 m3）

分布值平均值分布值平均值
岳11818.57~128.60.01~0.30.1230.64
岳11412.37~129.70.05~0.450.1310.81
岳122137~107.80.05~0.120.08微产气
岳106108~130.10.2~1.10.54.52
岳111187~11.58.90.05~0.40.167.28
岳1139.57~108.10.03~0.080.05微产气

Fig.4

Superposition diagram of high-yield well， gas water relationship and structural distribution of lithologic gas reservoir of Xujiahe Formation in Anyue gas field"

Fig.5

Distribution and accumulation models of the faults developed reservoir"

Fig.6

Logging curve of second member of Xujiahe Formation of Well Yue 114"

Table 3

Statistics of logging curve parameter of second member of Xujiahe Formation in the study area"

类型

自然伽马

/API

密度

/（g/cm3）

纵波速度

/（m/s）

横波速度

/（m/s）

纵横波

速度比

泊松比
泥岩120~1802.61~2.664 055~4 7352 530~2 8501.67~1.730.22~0.27
干层66~812.56~2.655 100~5 7603 100~3 3451.65~1.720.20~0.26
水层64~702.37~2.464 600~5 1502 880~3 1801.59~1.660.20~0.23
气层62~752.36~2.484 580~5 2852 930~3 3201.56~1.600.16~0.20

Fig.7

Crossplot of Poisson′s ratio and P-wave velocity of different lithology of second member of Xujiahe Formation in the study area"

Table 4

Summary of seismic amplitude and frequency spectrum characteristics of gas layer, water layer and dry layer[23]"

类型AVO近、远叠加剖面特征频谱特征
近道叠加远道叠加振幅差异
气层弱到中强振幅中强振幅，横向变化大，连续性差远道振幅比近道强主频较低，受吸收衰减影响较大
水层振幅较强振幅较强，同相轴光滑连续远道振幅比近道略为增强但不明显主频较高，受吸收衰减影响较小
干层中—弱反射、连续性较好弱振幅—空白反射、低频、杂乱，不连续远道振幅比近道减弱主频较高，受吸收衰减影响较小

Fig.8

Comparison section of near and far seismic trace reflection characteristics of typical gas and water layers"

Fig.9

Comparison section of near and far seismic trace reflection characteristics of typical gas and dry layers"

Fig.10

Spectrum analysis of gas layer， water layer and dry layer in second member of Xujiahe Formation in the study area"

Fig.11

Prediction plan of AVO favorable gas bearing area in second member of Xujiahe Formation in Anyue-Penglai-Moxi areas"

Fig.12

Analysis of well-seismic coincidence degree for prediction of gas-bearing favorable areas"

Fig. 13

Fracture distribution at the bottom boundary of third member of Xujiahe Formation in Anyue-Penglai-Moxi areas"

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