本研究的主要目的是研究一個簡化的方法，將複雜滲透率分佈(非均質)的地層簡化為某一個具代表性的平均滲透率均質之地層，並利用數值模擬法計算複雜滲透率分佈的地層與簡化滲透率的地層於二氧化碳注儲期間之井底流壓變化，推估其注儲能力並進行比對。
本研究中之研究步驟為：(1)單相(水層注水)之滲透率均質地層的單層模式與多層模式之壓力比對；(2)單相非均質地層之平均滲透率估算研究；(3)兩相(油層注水)均質地層之單層模式與多層模式之壓力比對；(4)兩相(油層注水)非均質地層之平均滲透率估算研究；(5)兩相(水層注二氧化碳)均質地層之單層模式與多層模式研究；(6)兩相(水層注二氧化碳)非均質地層之平均滲透率估算研究；(7)案例研究。
由本研究所獲得之結果可知：(1) 在水層注水時不論滲透率為均質或非均質(包括滲透率均向及異向)，皆可將多層模式地層利用平均滲透率簡化為單層模式地層，且壓力比對結果一樣。而在油層中注水時，同樣可利用平均滲透率的方式將多層地層以單層地層表示，其壓力的比對結果也相同。另外在水層注二氧化碳時，在將多層模式轉化為單層模式時需考慮重力因素所產生之壓力差，但若以平均滲透率表示的多層模式地層與滲透率分佈不同之地層比對時，壓力的比對結果也會相同。
(2) 以現場地層的滲透率資料進行平均滲透率之估算時，若為定注入率注入時，簡化滲透率模式與原始滲透率分佈的地層模式之井底流壓比對結果相近；若為定壓力注入時，注入率的比對結果也相近。因此，以平均滲透率所表示的地層所計算出之二氧化碳注儲能力，可做為二氧化碳封存於滲透率分佈複雜之地層時，其二氧化碳注儲能力的推估。
由以上研究可證明，利用平均滲透率的計算可簡化複雜滲透率分佈之地層，並可提供二氧化碳注儲工程上之參考。

The purpose of this study is to study a simplified method to make the heterogeneous reservoir have a representative average permeability. The bottom hole pressure of permeability heterogeneity and homogeneity will be compared by using numerical method, then the injectivity index of carbon dioxide sequestration can be estimated.
The major works in this study include: (1) The bottom hole pressure validation of homogeneous reservoir from one-layer and multi-layer models, for the case of water injection into an aquifer; (2) The study of effect of permeability heterogeneity on the pressure and injectivity calculation for the case of water injection into an aquifer; (3) The bottom hole pressure validation of homogeneous reservoir from one-layer and multi-layer models, for the case of water injection into an oil reservoir; (4) The study of effect of permeability heterogeneity on the pressure and injectivity calculation, for the case of water injection into an oil reservoir; (5) The bottom hole pressure validation of homogeneous reservoir from one-layer and multi-layer models, for the case of CO2 injection into an aquifer; (6) The study of effect of permeability heterogeneity on the pressure and injectivity calculation, for the case of CO2 injection into an aquifer; (7) A case study of injectivity estimation of CO2 sequestration.
The major results obtained from this study are: (1) the equation of average permeability estimation can be used to simplify the complex permeability distribution system (i.e., heterogeneity reservoir) for injectivity calculation. In the cases of single-phase, water-flooding and gas flooding, the multi-layer heterogeneity reservoir can be simplified to homogeneous reservoir with a representative average permeability reservoir for pressure and injectivity calculation. (2) In the case study, the equation of average permeability estimation is used for a heterogeneity aquifer of CO2 sequestration in NW Taiwan to calculate the pressure and injectivity of CO2 injection well. Both cases of constant rate injection and constant pressure injection are been conducted. The pressure and injectivity calculation of the simplified homogeneous reservoir with the representative average permeability is identical to that of the heterogeneous reservoir.

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