潜江凹陷潭口凸起带古近系潜江组三段碳酸盐岩油藏特征及富集高产主控因素

doi:10.3969/j.issn.1672-7703.2024.06.005

摘要/Abstract

摘要： 潜江盐湖盆地碳酸盐岩油藏勘探获突破，但不同试油井试油产量和稳产效果有差异，为明确该类型油藏油气富集高产的主控因素，优选碳酸盐岩油藏资料丰富的潭口凸起带，利用H61X 井200 余米岩心、薄片、热解、孔渗分析测试资料，结合研究区6 口油井试油数据，开展碳酸盐岩油藏特征分析。研究表明，盐湖碳酸盐岩储层孔隙度介于2.2%～12.4%，渗透率介于0.15～3.13mD，表现出低孔、低渗—特低渗特征；结合试油效果分析表明，同一类型碳酸盐岩中高碳酸盐含量可形成更多晶间孔，提高总储集空间、促进油气富集；近源圈闭更有利于油气富集，近洼陷油井试油日产量和后期稳产效果更好；储层厚度和原油物性影响单井稳产效果，储层厚度大于10m、原油黏度小于200mPa·s 的井持续稳产能力好；“复合酸压加砂”改造工艺可达到扩孔、增渗作用，增强碳酸盐岩储层导流能力，是提高碳酸盐岩油藏产量的关键技术。湖相碳酸盐岩展现出良好的出油能力和潜力，是潜江凹陷未来重要的勘探领域。

关键词: 潜江凹陷, 碳酸盐岩, 试油, 油气富集, 主控因素

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

中图分类号:

TE112.32

赵文, 孔金平, 文辉, 杨希. 潜江凹陷潭口凸起带古近系潜江组三段碳酸盐岩油藏特征及富集高产主控因素[J]. 中国石油勘探, 2024, 29(6): 56-67.

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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