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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (9): 1358-1371.doi: 10.11764/j.issn.1672-1926.2021.03.013

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Facies control of weathering crust reservoir in Mawu1-4 sub-members of Ordos Basin： Case study of Tao 2 block in Sulige Gas Field

Xinqi CHI1,2(),Qianghan FENG3,Shumei XU1,2,4(),Pengcheng SHU1,2,Jiahao KONG1,2,Huiqi CUI1,2,Huilei MA1,2   

  1. 1.College of Marine Geosciences，Ocean University of China，Qingdao 266100，China
    2.Key Lab of Submarine Geosciences and Prospecting Techniques，Ministry of Education，Qingdao 266100，China
    3.Changqing Oilfield Company，PetroChina，Xi’an 710021，China
    4.Frontiers Science Center for Deep Ocean Multispheres and Earth System，Qingdao 266100，China
  • Received:2021-02-08 Revised:2021-03-12 Online:2021-09-10 Published:2021-09-14
  • Supported by:
    The Scientific Research and Technology Research Project of Changqing Oilfield Branch of CNPC(DSCQC-2019-370)

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Abstract:

The fifth Member of Majiagou Formation of the Lower Paleozoic in Ordos Basin experienced weathering karstification and formed weathering crust karst reservoir dominated by gypsum-bearing dolomite. Through the coring observation of Mawu1-4 sub-members in the study area， it is found that the karst features are quite different from the traditional carbonate weathering crust. This paper analyzes the pore development characteristics of gypsum bearing dolomite in Mawu1-4 sub-members through microscopic observation， identifies different sedimentary cycles through sea level change analysis， divides sedimentary microfacies based on this， studies the facies control of weathering crust reservoir， and discusses the genetic mechanism of facies controlled reservoir. The Mawu1-4 sub-members of the study area belongs to the tidal flat sedimentary environment， and the gypsum， dolomite and calcareous deposits coexist and develop， forming five sedimentary cycles of shallow sea level. From bottom to top， they are respectively the dolomitic limestone and calcareous dolomite microfacies bearing tidal flat of subtidal zone， the dolomite and karst breccias bearing tidal flat of intertidal zone， and the anhydrite bearing tidal flat of the supratidal zone. Therefore， the weathering crust reservoir in the study area has obvious facies controlled characteristics. In the process of karstification， the gypsum bearing dolomite in supratidal zone formed a unique pore structure of "small holes and micro cracks". The reservoir type of Mawu1-4 sub-members in the study area is stratified facies controlled stratigraphic closed gas reservoir， and the favorable microfacies are the anhydrite bearing tidal flat of the supratidal zone. The weathering crust reservoir is controlled by the distribution of gypsum bearing dolomite on the plane， and the pore distribution and physical properties are obviously homogeneous.

Key words: Dissolution pores of anhydrite nodule and crystal, Gypsum dolomite, Gypsum dolomite plateau in supratidal zone, Facies control, Majiagou Formation, Tao 2 block

CLC Number: 

  • TE122.2

Fig.1

The tectonic unit （a） of the Ordos Basin and location of the study area and the weathered crust microgeomorphology map （b） of the study area（contour line unit： m）"

Fig.2

The dissolution pores of anhydrate crystals and nodules developed in gypsum bearing dolomite（core photograph）"

Fig.3

Fine grained-microcrystalline dolomite （cast thin section photograph）"

Fig. 4

Karst breccia （core photograph）"

Fig.5

Secondary limestone （cast thin section photograph）"

Fig.6

The continuously enlarged semi-filled mold holes of anhydrate crystals and nodules in powder crystal gypsodolomite（SEM photograph）"

Fig.7

The characteristics of mold pore of anhydrate crystals and nodules and the associated swelling microcracks in gypsodolomite in the Mawu1-4 sub-members in the study area （polarizing micrograph）"

Fig.8

Plane distribution of sedimentary microfacies of Mawu12-Mawu31 sublayers"

Fig.9

Plane distribution of sedimentary microfacies of Mawu32-Mawu43 sublayers"

Fig.10

Integrated column chart and sea level rise and fall cycles in the Mawu1-4 sub-members of Well Tao 34 in the study area"

Fig.11

Contrastive profiles of lithologic and sedimentary microfacies of Wells Tao 2-8-29，Tao 2-10-29， Shan 166，Tao 53，Shan 147［the location of section is in Fig.1（b）］"

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