斷裂活動中的瞬時流場及斷裂的輸導(dǎo)性研究:以庫車前陸盆地克拉蘇沖斷帶為例
[Abstract]:The open fault during the active period will affect the distribution of the formation flow field. How to restore the instantaneous flow field in the fault activity and how to quantitatively evaluate the conductivity of the fault during the active period is still a weak link in the study of the relationship between the fault and the fluid migration. This paper attempts to use the numerical simulation method, on the basis of the establishment of heterogeneous geological model, under the condition that the initial flow field before fault activity and the final flow field after fault activity are known, the permeability coefficient, which is the key parameter that affects the formation flow field, is constantly adjusted. Finally, the transient flow field and the permeability of the fault active period are obtained, which are consistent with the final flow field. Taking the Klassou thrust belt of Kuqa Foreland Basin as an example, the simulation results show that relatively high gas uplift appears at the top of the active fault, and the fluid tends to migrate to the surrounding rock, which is the release area of the fluid. At the bottom of the fault, there is a "U" zigzag concave with relatively low gas potential, which is the suction area of the fluid, the vertical gas potential gradient of the fault zone decreases and the dynamic force of the vertical migration of the fluid weakens, but because of the high permeability of the fault zone, it can make up for the lack of the dynamic force. Under the action of pump suction, deep natural gas can be transported to the top of the fault. The different action intensity of "pump suction" of different faults determines which faults will become the main "gas source faults" and the enrichment degree of gas reservoirs with fault as the migration channel. The permeability of the underlying F2-k fault in Kela 2 gas reservoir is 24.9 渭 m ~ (2), which is obviously higher than that of the low F _ 3 fault of Da Bei _ 1 gas reservoir 5.78 脳 10 ~ (-3) 渭 m ~ (2), which is the main reason for the difference of enrichment degree between the two reservoirs.
【作者單位】: 西北大學(xué)大陸動力學(xué)國家重點(diǎn)實(shí)驗(yàn)室;西北大學(xué)地質(zhì)學(xué)系;
【基金】:國家自然科學(xué)基金項(xiàng)目(41672121) 西北大學(xué)大陸動力學(xué)國家重點(diǎn)實(shí)驗(yàn)室開放課題基金項(xiàng)目
【分類號】:P618.13
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