Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (5): 742-754.doi: 10.11764/j.issn.1672-1926.2022.01.012

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Prospects of oil and gas displays and exploration of the Middle Permian Qixia Formation in the northern Guizhou

Maohui LUO1,2(),Yuliang MU1,2,Ganlu WANG1,2(),Zhengshan CHEN3,Zaiping SHI4,Xinnian LI5,Yuanhong LI5   

  1. 1.College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China
    2.Petroleum Society of Guizhou Province,Guiyang 550025,China
    3.No. 117 Geological Team,Guizhou Bureau of Geological Mineral Exploration and Development,Guiyang 550018,China
    4.The 3rd General Team of Guizhou Nonferrous Metals and Nuclear Industry Geological Survey Bureau,Zunyi 563000,China
    5.No. 106 Geological Party of Guizhou Bureau of Geological Mineral Exploration Development,Zunyi 563000,China
  • Received:2021-08-30 Revised:2022-01-12 Online:2022-05-10 Published:2022-05-12
  • Contact: Ganlu WANG E-mail:luomaohui2021@163.com;932276955@qq.com
  • Supported by:
    The Plan Project of Science and Technology Department of Guizhou Province, China(Grant No. Qiankehe Foundation [2020]4Y037);the Geological Exploration Fund Project of Guizhou Province, China(208-9912-JBN-L1D7)

Abstract:

In recent years, the limestone-marl alternations of the Middle Permian Qixia Formation within several synclines in northern Guizhou have repeatedly shown natural gas. To clarify whether the formation has the prospect of natural gas exploration in the northern Guizhou, the developmental distribution characteristics, and organic geochemical characteristics of the limestone-marl alternations of the Middle Permian Qixia Formation in the northern Guizhou were investigated by using field profile measurements, drilling core compilation and experimental analysis tests. The results show that the Middle Permian Qixia Formation in northern Guizhou is mainly distributed in the core of each syncline, with a thickness of 100-210 m, and gradually thin from northwest to southeast. The thickness of the limestone-marl alternations at the top of the Qixia Formation is large of 40-60 m; the marl component in the limestone-marl alternations is rich in organic matter, with an average TOC content of 0.77%; its maturity is moderate, with RO in the range from 2.08% to 2.56%, which is in the over-mature stage, and the organic matter type is excellent, being Type I and II. It has similar characteristics with southeast Sichuan Basin where gas breakthrough has been achieved and has good potential for gas exploration. Combined with the geological and tectonic characteristics, the study area is divided into 15 favorable zones of gas exploration types I and seven favorable zones of type II, with a total area of 5392.9 km2. If the future exploration of Longmaxi Formation shale gas in these favorable areas is combined with the natural gas exploration in the limestone-marl alternations of Qixia Formation, once the exploration and development are successful, it will become another new layer system with broad exploration prospects after the Longmaxi Formation shale gas in northern Guizhou and its adjacent areas.

Key words: Hydrocarbon shows, Unconventional natural gas, Exploration potential, Limestone-marl alternations, Qixia Formation, Northern Guizhou

CLC Number: 

  • TE122.1

Fig.1

The regional geological map, contour map of the thickness distribution and burial depth map of the bottom boundary of Qixia Formation in northern Guizhou"

Fig.2

The histogram of stratigraphic features in Qixia Formation of Middle Permian in northern Guizhou (field outcrop measured profiles in Xishui)"

Fig.3

The drilling (well) distribution(a) of the syncline in the Luolong, Daozhen and profile of AB exploration line(b)"

Fig.4

The characteristics of limestone-marl alternations"

Fig.5

The connecting well profile of Qixia Formation in northern Guizhou"

Fig.6

The thickness distribution of the ③-layered limestone-marl alternations of the Qixia Formation in northern Guizhou"

Fig.7

The frequency diagram of TOC content distribution"

Fig.8

Raman spectroscopy of solid organic matter"

Table 1

The organic geochemical feature’s comparison between limestone-marl rhythmic layers in northern Guizhou and southeastern Sichuan Basin"

项目TOC/%RO/%厚度/m储集空间埋深/m
綦江20泥质灰岩0.07~2.410.831.71~2.181.9459~89晶间孔、粒间溶孔以、裂缝1 200~4 350
泥晶灰岩0.03~0.880.17
南川16泥质灰岩+泥晶灰岩0.08~5.10.671.83~2.782.3175粒内溶蚀孔、粒缘溶蚀缝1 000~1 250
涪陵11泥质灰岩0.21~2.410.861.71~2.181.9440~50粒缘孔(缝)、成岩收缩孔(缝)、有机质孔和裂缝
泥晶灰岩0.03~0.430.13
研究区泥质灰岩0.41~2.210.772.55~3.343.03640~60溶蚀孔洞、裂缝500~4 000
泥晶灰岩0.02~0.790.37

Table 2

The distribution of favorable areas for carbonate source rock gas in the limestone-marl alternations of the Middle Permian Qixia Formation in northern Guizhou"

构造

区带

序号向斜名称Ⅰ类有利区面积 /km2Ⅱ类有利区面积 /km2
赤水陆相盆地区(1)复兴背斜0250.4
(2)宝源背斜043
(3)官渡背斜0204.5
(4)隆兴向斜223.4882.3
遵义台地区茅台向斜715.8389.1
二郎向斜35.656.5
松坎向斜332.7161.9
五马—楚米向斜862.382.6
养龙司向斜35.80
花大坪向斜490
安场向斜101.10
道真向斜302.57.8
洛龙向斜35.90
桃园向斜79.60
?浞水向斜125.40
?务川向斜158.20
?绥阳向斜150.40
?高山向斜107.10

Fig.9

The favorable areas for carbonate source rock gas in the limestone-marl alternations of the Middle Permian Qixia Formation in northern Guizhou(see Table 2 for syncline serial number in the figure)"

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