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The Thermodynamic Simulation of Diagenetic Processesin Cretaceous High Quality Reservoir of the Kela 2 Gas Fieldin Kuqa Depression of Tarim Basin

Author: HanHuiPing
Tutor: LaiXingYun；YuBingSong
School: Chinese Geology University (Beijing)
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Kela 2 Gas Field Diagenesis Secondary porosity Water - rock interaction
CLC: P618.13
Type: Master's thesis
Year: 2005
Downloads: 194
Quote: 0
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Abstract


Sedimentary reservoir porosity, permeability and other physical properties of the essential oil, natural gas and other mineral resources evaluation factors . Diagenesis affecting sedimentary pore geometry and pore final type process , especially in sediments of deep water during - rock interaction direct result of precipitation and dissolution of certain minerals , thereby affecting the development of secondary porosity . In this paper, the Kela-2 gas field reservoir study to explore the vertical depth in the area , porosity , permeability and mineral assemblages change in the structure , secondary porosity is important reservoir space of reservoir and long the stone framework grains and calcite cement dissolution closely related . The reaction based feldspar and calcite dissolved in the groundwater Gibbs free energy ΔG value , determine diagenesis mineral dissolution or precipitation trends . Kela 2 gas field in plagioclase anorthite component framework grains basically suffered thorough dissolution , the contribution of secondary porosity the albite dissolution limited extent , the potassium feldspar basically not dissolution . Calcite dissolution and precipitation and groundwater chemistry relatively close relationship T lt ; 90 ° C strata the calcite performance for to completely precipitate formation characteristics of the cement , there is a considerable amount of calcite cement in the range T ≈ 90 ~ 105 ℃ be dissolved , and the formation of a large number of intergranular dissolved pore , it is one of the important factors carat 2 gas field development of secondary porosity . Calcite cementation and feldspar framework grain dissolution diagenesis formation characteristics of secondary pore geometry , connectivity , distributed manner , further separation of the three types of secondary porosity combinations , CF , F or C-type and the combination of characteristics of secondary porosity in the Kela-2 gas field , different combinations of secondary porosity of the rock porosity and permeability .

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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