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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (3): 375-384.doi: 10.11764/j.issn.1672-1926.2019.10.005

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Characteristics and classification evaluation of tight gas reservoirs in the 1st member of Quantou Formation of Helong-Lanjia inversion zone in Dehui Fault Depression

Xin-fei SONG1(),Zhong-cheng LI2,Xian-tao GUO3,Long-hui BAI4,Zhi-long LI5   

  1. 1.School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2.Exploration and Development Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China
    3.School of Geosciences, Yangtze University, Wuhan 430100, China
    4.Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
    5.PetroChina Daqing Oilfield Limited Company, Daqing 163318, China
  • Received:2019-08-11 Revised:2019-10-03 Online:2020-03-10 Published:2020-03-26
  • Supported by:
    The Training Plan of Young Innovative Talents in Colleges and Universities of Heilongjiang Province, China(QC2015043)

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Abstract:

Fine reservoir evaluation and classification is of great significance to the development of tight sandstone gas resources. In this paper, the development regularity and effective reservoirs distribution of tight gas reservoir in the 1st member of Quantou Formation of Helong-Lanjia inversion belt in Dehui Fault Depression were ascertained from the aspects of reservoir petrology, pore type, diagenetic evolution and reservoir classification by means of cast thin section and scanning electron microscope. The results show that the porosity of the tight gas reservoirs in the first member of Quantou Formation of the study area is mainly composed of intergranular and intragranular pores, and the porosity is mainly composed of low-porosity and low-permeability or ultra-low permeability. The diagenetic evolution sequence is as follows: (1) early diagenetic phase A-B, kaolinite precipitation and quartz secondary enlargement mark the early compaction; (2) early diagenetic phase B, a few unstable components can be metasomatized by calcite and calcite intergranular cementation occurs. Later, some calcite formed in the early period of dolomite metasomatism formed the metasomatism residue of calcite in dolomite; (3)middle diagenetic phase A, environment with acidic water will induce the precipitation of kaolinite and the dissolution of carbonate minerals; (4) middle diagenetic phase B, the precipitation of iron dolomite and calcite, and the increase of quartz will cause great pore reduction, later dissolution is weak, the compact degree of reservoir is strengthening. The k-means clustering method is used to divide the reservoirs in the study area into four categories, of which the III and IV reservoirs are dominant, and the I reservoirs are mainly located in the north and middle of the study area, accounting for about 5% of the four types of reservoirs. The distribution range of type II reservoirs is larger than that of type I reservoirs, accounting for about 10% of the four types in the northern part of the study area. Class III reservoirs have the largest distribution range, accounting for about 60% of the four types of reservoirs. The type IV reservoirs which are distributed in forms of sheet and belt-like are more developed than the type II reservoirs, accounting for about 25% of the four types of reservoirs.

Key words: Reservoir characteristics, Reservoir evaluation, Tight gas, 1st member of Quantou Formation, Dehui Fault Depression

CLC Number: 

  • TE122.2

Fig.1

Geographical location map of Dehui fault depression"

Fig.2

Sandstone composition of the 1st member of Quantou Formation in the study area"

Fig.3

Histogram of median distribution of grain size of the first member of Quantou Formation"

Fig.4

Histogram of sorting coefficient distribution of the first member of Quantou Formation"

Table 1

Statistical tables of composition, structures and fillers of sandstone in the 1st member of Quantou Formation in research area"

井号层位填隙物/%碎屑/%分选磨圆

主要胶结

类型

高岭石灰质泥质石英加大岩屑长石石英
合9K1q10.034.363.580.2421.840.5537.64中次棱孔隙—接触
合105.2521.250.5017.530.551.75好次棱孔隙
合115.8910.51.830.4425.140.2834.67中—好次棱孔隙
德深4067.504235.522.5中次棱孔隙
布44.1180.671.441633.8950.11好—中次棱孔隙

Fig.5

Histogram of interstitial fillings distribution of the 1st member of Quantou Formation"

Fig.6

Microscopic characteristics of illite"

Fig.7

Microscopic characteristics of kaolinite"

Fig.8

Dissoluted intergranular pore and dissoluted intragranular pore of the reservoir in the 1st menber of Quantou Formation in the study area"

Fig.9

Diagram of relationship between porosity and permeability in the 1st member of Quantou Formation"

Fig.10

Pore evolution model of Dehui reservoir"

Table 2

Table of reservoir evaluation and classification in the 1st member of Quantou Formation"

储层类型砂厚/m泥质含量/%渗透率/(10-3μm2)孔隙度/%沉积相类型
I>900~20>5>9辫状河三角洲前缘、曲流河三角洲前缘
Ⅱ70~9020~301.5~58~9辫状河三角洲平原、曲流河三角洲平原
Ⅲ40~7030~371~1.57~8泛滥平原扇三角洲前缘
Ⅳ<40>37<1<7火山岩相浅湖—半深湖

Fig. 11

Statistical histogram of reservoir types in the 1st member of Quantou Formation"

Fig. 12

Different type reservoirs distribution map of reservoir types in the 1st member of Quantou Formation"

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