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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  38(4): 868-875.
Guang FU, JinMeng DONG, WanTao PENG. Determination Method and Application for the Conversion Period of Fault⁃caprock Configuration Leakage and Sealing[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 868-875. doi: 10.14027/j.issn.1000-0550.2019.090
Citation: Guang FU, JinMeng DONG, WanTao PENG. Determination Method and Application for the Conversion Period of Fault⁃caprock Configuration Leakage and Sealing[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 868-875. doi: 10.14027/j.issn.1000-0550.2019.090
shu

Determination Method and Application for the Conversion Period of Fault⁃caprock Configuration Leakage and Sealing

doi: 10.14027/j.issn.1000-0550.2019.090
Funds:

National Natural Science Foundation of China 41872157

  • Received Date: 25 Jul 2019
  • Publish Date: 10 Aug 2020
    Abstract
  • In order to study the control effect of faults on hydrocarbon accumulation in petroliferous basins, we examine the fault⁃caprock configuration leakage, sealing mechanism, and its transformation period. By determining the growth period of connection and the period for which the fault ancient displacement pressure is equal to the reservoir ancient displacement pressure, we can confirm the leakage and sealing transformation period of the fault⁃caprock configuration. We then apply the results to fault F1 and the east 2 mudstone caprock configuration in the Nanbao No. 5 structure, Nanpu Sag, Bohaiwan Basin. In lines L1, L3, L4, L5, L6, L7, and L9, the F1 fault and east 2 mudstone caprock configuration are in a closed condition, there is no leakage, and it is beneficial to oil and gas accumulation and preservation. In line L2, the F1 fault and the east 2 mudstone caprock configuration began to shift from closure to leakage around 16 Ma and from leakage to closure at 7.4 Ma. In line L8, the F1 fault and east 2 mudstone caprock configuration began to shift from closure to leakage around 13.6 Ma and for leakage to closure around 8.0 Ma. At present, in lines L8 and L2, the F1 fault and east 2 mudstone caprock configuration are in the closed condition, and leakage time is relatively long, which is beneficial to oil and gas accumulation and preservation in the east 2 reservoir. This is consistent with the distribution of oil and gas in east 2 near the F1 fault of the Nanbao No. 5 structure at present, showing that this method is feasible for determining the conversion period between fault⁃caprock configuration leakage and closure.

     

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