Characteristics and main control factors for enrichment and high-yield production of carbonate oil reservoirs in the third member of the Paleogene Qianjiang Formation in Tankou bulge zone of Qianjiang Sag

doi:10.3969/j.issn.1672-7703.2024.06.005

Abstract

Abstract: Breakthroughs have been made in the exploration of carbonate oil reservoirs in Qianjiang salt lake basin, but the tested oil production and steady production effects vary among wells. As a result, a comprehensive study is conducted on core (a length of more than 200 m), thin section, rock pyrolysis, and porosity and permeability experiment data of Well H61X, as well as well testing data of six wells in Tankou bulge zone with abundant oil reservoir data, and the characteristics of carbonate oil reservoirs are analyzed to clarify the main controlling factors for the enrichment and high-yield production of this type of oil reservoirs. The study results indicate that the porosity of salt lake carbonate reservoir is 2.2%–12.4%, and the permeability is 0.15–3.13 mD, showing characteristics of low porosity, and low to ultralow permeability. Combined with the analysis of well testing results, it shows that more intercrystal pores are developed in the same type of carbonate rock with a high carbonate content, increasing the total reservoir space, and promoting oil and gas enrichment. The near-source traps are more conducive to hydrocarbon enrichment, and oil wells near sub-sag have higher daily oil production and steady production effects in the later stage. The reservoir thickness and crude oil properties affect the steady production effect of a single well, and the well has a good sustained steady production performance with a reservoir thickness of greater than 10 m and crude oil viscosity of less than 200 mPa·s. The “composite acid fracturing and sand adding” reservoir reconstruction technology enables to increase porosity and permeability, and enhance the conductivity of carbonate reservoirs, which is a key technology for increasing production of carbonate reservoirs. The lacustrine carbonate rocks show excellent oil production capacity and resource potential, which is an important exploration filed in Qianjiang Sag in the future.

Key words: Qianjiang Sag, carbonate rock, well testing, oil and gas enrichment, control factors

CLC Number:

TE112.32

Zhao Wen, Kong Jinping, Wen Hui, Yang Xi. Characteristics and main control factors for enrichment and high-yield production of carbonate oil reservoirs in the third member of the Paleogene Qianjiang Formation in Tankou bulge zone of Qianjiang Sag[J]. China Petroleum Exploration, 2024, 29(6): 56-67.

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