Petroleum Science >2016, Issue 3: 418-433 DOI: https://doi.org/10.1007/s12182-016-0116-3
Characteristics of fault zones and their control on remaining oildistribution at the fault edge: a case study from the northernXingshugang Anticline in the Daqing Oilfield, China Open Access
文章信息
1 Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing 163318, Heilongjiang, China 2 Science and Technology Innovation Team in Heilongjiang Province ‘‘Fault Deformation, Sealing and Fluid Migration’’, Daqing 163318, Heilo;1 Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing 163318, Heilongjiang, China 4 Earth Science College, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;1 Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing 163318, Heilongjiang, China 2 Science and Technology Innovation Team in Heilongjiang Province ‘‘Fault Deformation, Sealing and Fluid Migration’’, Daqing 163318, Heilo;1 Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing 163318, Heilongjiang, China 2 Science and Technology Innovation Team in Heilongjiang Province ‘‘Fault Deformation, Sealing and Fluid Migration’’, Daqing 163318, Heilo;1 Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing 163318, Heilongjiang, China 2 Science and Technology Innovation Team in Heilongjiang Province ‘‘Fault Deformation, Sealing and Fluid Migration’’, Daqing 163318, Heilo;5 NO. 5 Production Plant, Huabei Oilfield Co., PetroChina, Xinji 052360, Hebei, China;5 NO. 5 Production Plant, Huabei Oilfield Co., PetroChina, Xinji 052360, Hebei, China
文章摘要
reached a later, high water cut stage, but oil recovery is still
only approximately 35 %, and 50 % of reserves remain to
be recovered. The remaining oil is primarily distributed at
the edge of faults, in poor sand bodies, and in insufficiently
injected and produced areas. Therefore, the edge of faults is
a major target for remaining oil enrichment and potential
tapping. Based on the dynamic change of production from
development wells determined by the injection–recovery
relationship at the edge of faults, we analyzed the control
of structural features of faults on remaining oil enrichment
at the edge. Our results show that the macroscopic structural
features and their geometric relationship with sand
bodies controlled remaining oil enrichment zones like the
edges of NNE-striking faults, the footwalls of antithetic
faults, the hard linkage segments (two faults had linked
together with each other to form a bigger through-going
fault), the tips of faults, and the oblique anticlines of soft
linkages. Fault edges formed two types of forward microamplitude
structures: (1) the tilted uplift of footwalls controlled
by inverse fault sections and (2) the hanging-wall
horizontal anticlines controlled by synthetic fault points.
The remaining oil distribution was controlled by microamplitude
structures. Consequently, such zones as the tilted
uplift of the footwall of the NNW-striking antithetic faults
with a fault throw larger than 40 m, the hard linkage segments,
the tips of faults, and the oblique anticlines of soft
linkage were favorable for tapping the remaining oil
potential. Multi-target directional drilling was used for
remaining oil development at fault edges. Reasonable fault
spacing was determined on the basis of fault combinations
and width of the shattered zone. Well core and log data
revealed that the width of the shattered zone on the side of
the fault core was less than 15 m in general; therefore, the
distance from a fault to the development target should be
larger than 15 m. Vertically segmented growth faults
should take the separation of the lateral overlap of faults
into account. Therefore, the safe distance of remaining oil
well deployment at the fault edge should be larger than the
sum of the width of shattered zone in faults and the separation
of growth faults by vertical segmentation.
关键词
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Fault edge Fault zone structure Segmentation growth Micro-amplitude structure Sealing Safety distance