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Distribution patterns and controlling factors for reservoir characteristic difference of oolitic shoals, Feixian’guan Formation, eastern Longgang area, SW China

  • Zhanlei Wang
  • Chan Jiang
  • Yuqiang Jiang
  • Jiewei Zhang
  • Yifan Gu
Original Paper
  • 44 Downloads

Abstract

In eastern Longgang area of northeastern Sichuan Basin, the Kaijiang-Liangping trough was deposited with and leveled up by Feixian’guan sediments, where oolitic shoals exhibit progradation and upward migration. These oolitic shoals are classified into oolitic dolostone shoals and oolitic limestone shoals. The dolostone shoals occur within a narrow belt along Changxingian platform margin where the thickness of one single layer can be large; however, the cumulative thickness is rather small. On the contrary, the limestone shoals spread widely along shifted platform margin and is characterized by small thickness of one single layer and large cumulative thickness. Diagenesis has been found to play an important role in oolitic reservoir properties. The origin of low porosity and permeability in this extensive oolitic limestone reservoirs was attributed to burial cementation, while diagenetic processes, such as, reflux and hydrothermal dolomitization, have been identified as the primary factors for generating high-grade oolitic dolostones. Feixian’guan reservoir is characterized by low matrix porosity (which usually ranges from 2 to 3%). Existence of fractures may improve overall porosity and permeability of these reservoirs. The direct influence of these fractures may be to connect originally isolated pores to form a better connected pore-fracture system. Additionally, the fractures may have facilitated the migration of the organic acids that are associated with oil and gas, to help further enhance the quality of the reservoir through corrosion.

Keywords

Oolitic shoal distribution Controlling factor Reservoir difference Feixian’guan Formation Triassic system NE Sichuan Basin 

Notes

Funding information

This research was supported jointly by the National Science and Technology Major Project (Grant No. 2016ZX05052) and National Science and Technology Major Project (Grant No. 2016E-0607).

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Zhanlei Wang
    • 1
    • 2
  • Chan Jiang
    • 3
  • Yuqiang Jiang
    • 1
    • 2
  • Jiewei Zhang
    • 4
  • Yifan Gu
    • 1
    • 2
  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengduPeople’s Republic of China
  2. 2.Key laboratoryChengduPeople’s Republic of China
  3. 3.Exploration Division of PetroChina Southwest Oil and Gas Field CompanyChengduPeople’s Republic of China
  4. 4.Northeastern Sichuan Oil and Gas DistrictPetroChina Southwest Oil and Gas Field CompanyDazhouPeople’s Republic of China

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