Tight Reservoir Characteristics and Formation Conditions of Tuff in Santanghu Basin

JIAO Li-xin, LIU Jun-tian, ZHANG Hong, FENG Ya-qin, WU Chao, ZHANG Qi, GUO Ke-cheng

doi:10.11764/j.issn.1672-1926.2014.11.1697

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 11: 1697 - 1705

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.11.1697

Tight Reservoir Characteristics and Formation Conditions of Tuff in Santanghu Basin

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Research Institute of Exploration and Development,Tuha Oil Field Company,PetroChina,Hami 839009,China

Received date: 2014-02-07

Revised date: 2014-04-25

Online published: 2019-09-20

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Abstract

The lithology of reservoir in P2t2 is dominated by tuff in Santanghu Basin,with some amount of debris,bioclastic and organic mud lines.It has the characteristic of sedimentation.Based on the analysis of rock slice,whole rock mineral and field-emission scanning electron microscope,combined with mercury injection capillary pressure curve data,a series of studies have been carried out on reservoir lithology,physical property,reservoir space and pore structure.Results show that the reservoir mainly contains bioclastic dacitic crystal crumbs-vitric tuff.Devitrification hole,microporous crystalline crumbs and intergranular corrosion holes are the main reservoir space.The porosity has an average of 16.1%,the permeability has an average of 0.24×10^-3μm²，and the oil saturation is averaged at 69.5%,belonging to a set of tight reservoir with medium-high porosity,ultra-low permeability and high oil saturation.The displacement pressure of reservoir is 3.92MPa and pore throat radius is 0.08μm.It is characterized by high reservoir displacement pressure,fine and homogeneously distributed throat.It is believed that tuffite of P₂t₂ was developed in shore-shallow lacustrine environment.Lack of lacustrine environment which has relatively stable supply of terrigenous materials is key to the tight reservoir of tuffite in the slope area. The slow airborne deposition of volcanic dust after the volcano controls the distribution of effective reservoir.

Key words： Tight reservoir; Formation conditions; Tuff; Tiaohu Group; Santanghu Basin

Cite this article

JIAO Li-xin, LIU Jun-tian, ZHANG Hong, FENG Ya-qin, WU Chao, ZHANG Qi, GUO Ke-cheng . Tight Reservoir Characteristics and Formation Conditions of Tuff in Santanghu Basin[J]. Natural Gas Geoscience, 2014 , 25(11) : 1697 -1705 . DOI: 10.11764/j.issn.1672-1926.2014.11.1697

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