关键词: 下生上储式, 断层圈闭, 含油气性, 综合定量评价, 南堡凹陷, 东一段

Abstract:

Based on an analysis of factors affecting the oil-gas-bearing of the fault traps in Nanpu Depression, a comprehensive and quantitative evaluation of the oil-gas-bearing of 8 fault traps of Ed₁ Formation in the east of number 2 structure of Nanpu Depression was conducted using fuzzy comprehensive evaluation, with an aim to provide a guide for oil and gas drilling there. The parameters used in the evaluation included types of oil source fault, ratio between sandstone and stratum thickness, types of the structural belt encompassing the fault trap, not faulted thickness of Ed₂, and faults lateral sealing capability of caprock. The results showed that all the three drilled fault traps where oil-gas was present had a value larger than 2. The drilled fault traps with higher values had higher oil-gas shows; on the other hand, lower values indicated lower oil-gas shows. As to the three undrilled fault traps, T4-51N fault trap exhibited the highest success rate of drilling, T4-21N fault trap implied a certain risk of drilling, and in T3-12S fault trap, wells should be drilled into the aquifer.

Key words: combination of lower generation and upper reservoir, fault trap, oil-gas-bearing, comprehensive and quantitative evaluation, Nanpu depression, Ed₁