Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 4: 21 - 29

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.04.003

Geologic Exploration

Diagenetic Evolution of Deep K1g3 Sandstone and Distribution of High-quality Reservoirs in Jiudong Oilfield

  • Tang Haizhong ,
  • Yang Nan ,
  • Zhou Xiaofeng ,
  • Feng Wei ,
  • Li Tao ,
  • Lei Fuping ,
  • Zhao Wei ,
  • Hu Dandan
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  • 1. PetroChina Yumen Oilfield Company, Jiuquan, Gansu 735019, China;
    2. China University of Petroleum (Beijing), Beijing 102249, China

Received date: 2021-10-11

  Revised date: 2022-05-26

  Online published: 2023-01-09

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Abstract

In view of the unclear distribution pattern of in deep high-quality K1g3 sandstone reservoirs in Jiudong Oilfield, Jiuquan Basin, the diagenetic characteristics, diagenetic evolution, diagenetic facies and high-quality reservoir distribution of sandstone were studied according to casting slice, scanning electron microscope, physical properties and other data. The results showed that the deep K1g3 sandstone in Jiudong Oilfield had three types of diagenetic characteristics, and the sandstone with Type Ⅱ and Ⅲ diagenetic characteristics was developed from Type Ⅰ iron-bearing dolomite cemented tight sandstone under the differential action of acidic dissolution fluid. There were three stages of acid dissolution fluid. The fluid was atmospheric freshwater in the first two stages, and was organic acid fluid in the third stage. The atmospheric freshwater then became a acidic fluid that contributed the most to sandstone dissolution. K1g3 sandstone could be divided into 4 types of diagenetic facies and 2 diagenetic facies belts. Type B diagenetic facies were high-quality reservoirs with high porosity and permeability, Type D diagenetic facies were reservoirs with medium porosity and low permeability, and Types A and C diagenetic facies were ankerite-bearing cemented tight and heterogeneous reservoirs. The main oil-producing area to the west of Chang2 Fault was a Type B diagenetic facies band, the expanded-margin area to the east was a Type D diagenetic facies band, and Types A and C diagenetic facies were not developed in general. The study results are of providing important reasons for the development plan adjustment and expanded-margin exploration and deployment of Jiudong Oilfield.

Key words： deep K1g3 sandstone; diagenetic evolution; high-quality reservoir; linear meteoric freshwater; Jiudong Oilfield; Jiuquan Basin

Cite this article

Tang Haizhong , Yang Nan , Zhou Xiaofeng , Feng Wei , Li Tao , Lei Fuping , Zhao Wei , Hu Dandan . Diagenetic Evolution of Deep K1g3 Sandstone and Distribution of High-quality Reservoirs in Jiudong Oilfield[J]. Special Oil & Gas Reservoirs, 2022 , 29(4) : 21 -29 . DOI: 10.3969/j.issn.1006-6535.2022.04.003

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