复杂断块断棱刻画技术研究

Research on fault edge depiction in complex fault block

孙晓霞

Sun Xiaoxia

中国石化胜利油田分公司地质科学研究院，山东 东营 257015

Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

胜利油区厚层断块油藏单层厚度大，储量大，开发上具有高含水、高采出程度、直井停产多等特征。开发后期沿断层一线剩余油比较富集，但含油条带窄，需要准确描述断棱的平面位置才能挖潜剩余油。文中以永3-1断块区为例，采用多技术精细刻画目的层的断棱平面形态。通过合理的地层对比，确定井上断点位置；利用精细构造解释，识别和描述断层形态及断层的平面组合；采用井震交融的井斜修正方法，保证钻遇断点和分层数据地下位置的准确性；再利用井震模结合技术，刻画断棱形态和位置。矿场实施效果表明，该区断棱刻画精度比较高，近断层完钻的5口水平井取得了显著的开发效果。

Thick-bedded fault block reservoirs of Shengli Oilfield indicate great monolayer thickness and large reserves, but they have entered the stage of high water cut and high recovery degree which caused the shut down of many vertical wells. Remaining oil enriches along the faults and has limited oil band at the late stage of development, therefore the plane positions of fault edge need to be accurately described in order to tap the potential of the faults in structural high parts where hydrocarbon is rich. Taking Yong3-1 fault block as an example in this paper, multiple meticulous depiction methodologies are applied to describe the plane shapes of fault edge in target bed. Proper stratigraphic correlation methods are used to determine the breakpoint position along a well. Fine structure interpretation methods are used to identify and describe the fault shapes and plane combinations. Log-seismic combined well deviation correction methods are used to ensure the accuracy of the location of breakpoints and formation layers. Well-seismic-modeling combined technology is used to depict the shapes and positions of fault edges. They are implemented in oilfield and the result shows that the fault edges in the study area are accurately depicted and development effect is improved for 5 near-fault horizontal wells.

10.6056/dkyqt201301014