Method of Fault Vertical Sealing Ability Judged by the Mudstone Content of Fault-rock and Its Application(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第05期
- Page:
- 660-667
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Method of Fault Vertical Sealing Ability Judged by the Mudstone Content of Fault-rock and Its Application
- Author(s):
- FU Guang; HU Xin-lei
- School of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
- Keywords:
- vertical sealing ability; fault; mudstone content; diagenetic time; mudstone caprock; source rock; Nanpu depression
- PACS:
- P618.13;TE122
- DOI:
- -
- Abstract:
- In order to judge the fault vertical sealing ability simply, based on the mechanism and influence factors of fault vertical sealing, the displacement pressures of faultrock and underlying reservoir rock were compared, and a set of convenient prediction method of fault vertical sealing ability by using the mudstone content of faultrock was established, and then the method was applied to study the vertical sealing ability of faults f1, f2, f3, f4, f5 in mudstone caprock of the second member of Dongying Formation of No.5 structure of Nanpu depression, Bohai Bay Basin. The results show that the mudstone contents of fault-rock of faults f1, f2, f4 are larger than the minimum of mudstone content required by vertical sealing of the three faults in mudstone caprock of the second member of Dongying Formation, so they are sealed in vertical; while the fault f1 is located outside the distribution range of source rocks from the third member of Shahejie Formation and the first member of Shahejie Formation-the third member of Dongying Formation,and the fault f2 effected by the configuration of fault and caprock, petroleum migrates along the fault, so that there is no petroleum accumulation whether the faults are sealed or not; the mudstone contents of fault-rock of faults f3, f5 are lower than the minimum of mudstone contents required by vertical sealing of the two faults in mudstone caprock of the second member of Dongying Formation, so they are open in vertical; though the faults f3, f5 connect the source rock and reservoir, petroleum would move upward through the caprock, and it is not favorable for petroleum accumulation. The evaluation has a good relation with currently discovered petroleum distribution underneath the second member of Dongying Formation of No.5 structure of Nanpu Depression, so that the method is favorable to simply judge the fault vertical sealing ability.
Last Update: 2016-09-30