塔里木盆地迪北致密砂岩气藏储层物性下限研究

doi:10.3969/j.issn.1673-8926.2015.01.012

LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 81-88.doi: 10.3969/j.issn.1673-8926.2015.01.012

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Study on the lower limit of physical properties of tight sandstone gas reservoirs in Dibei area, Tarim Basin

ZHANG Baoshou ¹,LU Xuesong ²,SUN Xiongwei ¹,LU Hui ³,LU Yuhong ¹,TIAN Hua²

1. Research Institute of Exploration and Development ， PetroChina Tarim Oilfield Company ， Korla 841000 ， Xinjiang ， China ；2. PetroChina Research Institute of Petroleum Exploration & Development ， Beijing 100083 ， China ；3. College of Earth Sciences ， Northeast Petroleum University ， Daqing 163318 ， Heilongjiang ， China

Online:2015-02-03 Published:2015-02-03

Abstract

Abstract:

The Jurassic Ahe Formation in Dibei gas reservoir is characterized by low porosity and low permeability tight sandstone reservoir, strong heterogeneity and the complex oil and gas distribution. The lower limit of effective reservoir properties is uncertain, which is critical for reservoir evaluation, gas reserve and resources computation. Based on the data of reservoir properties, logging, oil testing and mercury measurement, combined with NMR and lowtemperature adsorption experiment results, this paper applied six methods including minimum flow pore throat radius, displacement pressure, bound water saturation, oil occurrence, oil testing and distribution curve to determine the lower limit of effective reservoir properties of Ahe Formation in Dibei area. The result shows that the lower limit of porosity and permeability of the Formation are 2.6% and 0.08 mD respectively. From J₁a¹, J₁a²to J₁a³, that is the three lithology members from top to bottom, reservoir properties gradually decrease, and the lower limits of reservoir properties gradually decrease correspondingly. The lower limits of porosity of J₁a¹, J₁a²and J₁a³reservoir are 3.0%, 2.6% and 2.2% respectively, and the lower limits of permeability are 0.14 mD, 0.09 mD and 0.065 mD respectively. The understanding of lower limit of reservoir properties has some significance for the resource and gas reserve re-evaluation, reservoir evaluation and gas development design in Dibei gas reservoir.

Key words: shale reservoirs, sedimentary environment, framboids pyrite, Doushantuo Formation, middle Yangtze area

ZHANG Baoshou,LU Xuesong,SUN Xiongwei,LU Hui,LU Yuhong,TIAN Hua. Study on the lower limit of physical properties of tight sandstone gas reservoirs in Dibei area, Tarim Basin[J].LITHOLOGIC RESERVOIRS, 2015, 27(1): 81-88.

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