Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (11): 1574-1584.doi: 10.11764/j.issn.1672-1926.2020.08.009

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Pore evolution characteristics and distribution of favorable reservoir area of the Upper Permian Wujiaping Formation in the Northwestern Sichuan

Min-xing LI1,2(),Hai-zhou QU1,2(),Qi ZENG3,Hong YIN3,Yun-feng ZHANG1,2,Mao-yao LIU1,2,Yan-feng LI1,2   

  1. 1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
    2.Branch of Deposition and Accumulation,PetroChina Key Laboratory of Carbonate Reservoir,Chengdu 610500,China
    3.Branch of Chuanxibei Gas Field,PetroChina Southwest Oil and Gas Field Company,Jiangyou 621700,China
  • Received:2019-07-04 Revised:2020-08-07 Online:2020-11-10 Published:2020-11-25
  • Contact: Hai-zhou QU E-mail:li.minx@163.com;quhaizhou@swpu.edu.cn

Abstract:

Through the study of a large number of cores, slices, scanning electron microscopes, well logs and physical properties, the petrological characteristics, pore characteristics, pore diagenesis and evolution characteristics of the pyroclastic rocks of Wujiaping Formation in northwestern Sichuan were analyzed. On this basis, favorable reservoirs lithology distribution was studied. The pyroclastic rocks of Wujiaping Formation mainly include tuff, tuffite, tuff mudstone and tuff siltstone, etc., which are mainly distributed in the Wu 2 Member, while the distribution of Wu 1 Member and Wu 3 Member is less. Due to the effects of devitrification, dissolution, cementation, replacement and compaction, pyroclastic rocks mainly develop shrinkage pores, intergranular dissolution pores, and intragranular dissolution pores. In the early diagenetic stage A, devitrification promotes the development of shrinkage pores, thereby increasing the porosity; in the early diagenetic stage B, cementation and compaction cause the porosity to decrease; when entering the mid-diagenetic stage A, the metasomatism reduces the porosity slightly. The porosity of pyroclastic rocks as a whole is characterized by high porosity, and thickness of layer of pyroclastic reservoir is from 1.3 m to 60.9 m. The total thickness of the reservoirs varies greatly. The favorable reservoir areas are mainly concentrated in Shuangyushi-Longgangxi areas, which is a favorable exploration target in the study area.

Key words: Northwestern Sichuan, Wujiaping Formation, Pyroclastic rocks, Pore characteristics, Distribution of reservoirFoundation items:The National Natural Science Foundation of China(Grant Nos.41702163, 41702122), The Open Fund of Key Laboratory of PetroChina Carbonate Reservoir(Grant No.2018-497).

CLC Number: 

  • TE122.2

Fig.1

Geographical location of northwestern Sichuan"

Table 1

Classification of pyroclastic rocks of Wujiaping Formation in northwestern Sichuan"

类型岩石成分沉积构造
正常火山碎屑岩类凝灰岩火山碎屑物质>90%,粒径小于0.01 mm层状构造不明显
沉火山碎屑岩类沉凝灰岩火山碎屑物质>50%,陆源碎屑<50%

成层构造明显

火山碎屑沉积岩类凝灰质泥岩黏土矿物>50%,火山碎屑物质>10%
凝灰质粉砂岩粉砂岩>50%,火山碎屑物质>10%

Fig.2

Pyroclastic rocks of Wujiaping Formation in northwestern Sichuan"

Fig.3

Stratigraphic comparison of Wells ST9-ST8-Pengshang Section-Wells ST3-SY001-1-LG70- YB7-L104-WJ1(modiefied from Ref.[29])"

Fig.4

Pore types of pyroclastic rocks of Wujiaping Formation in northwestern Sichuan"

Fig.5

The diagenesis of pyroclastic rocks of Wujiaping Formation in northwestern Sichuan"

Fig.6

Pore evolution of pyroclastic rocks in Wujiaping Formation in northwestern Sichuan"

Table 2

Statistical tables of pyroclastic rock reservoirs of typical wells in Wujiaping Formation"

井名深度范围/m厚度/m孔隙度/%渗透率/(10-3 μm2储能系数储层评价岩性层位
LG70井7 068.5~7 103.432.97.30.0063.6气层凝灰岩吴二段
7 108.5~7 118.98.64.80.005 1气层凝灰质粉砂岩吴二段
7 134.2~7 156.119.15.60.005 9气层沉凝灰岩夹生屑泥晶灰岩吴二段
ST1井6 723.9~6 761.735.57.70.007 52.7气层沉凝灰岩夹泥晶凝灰质灰岩吴二段
SY001-1井6 792.8~6 864.849.98.90.0084.4气层沉凝灰岩、凝灰质泥岩吴二段
ST10井7 061.9~7 071.333.20.004 90.1差气层沉凝灰岩吴一段
L104井6 196.4~6 202.51.32.20.0040.03含水层凝灰质粉砂质泥岩吴二段

Fig.7

Reservoir contrast diagram of Wujiaping Formation in the northwestern Sichuan"

Fig.8

Plane distribution map of tuff thickness of Wujiaping Formation in the northwestern Sichuan"

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