Segmentation of Strike-Slip Faults and Its Controls on Hydrocarbon Accumulation in Tarim Basin:A Case Study of FⅠ17 Strike-Slip Fault Zone
In the Ordovician carbonate rocks in the Tarim basin,there are extra-large oil and gas oilfields controlled by strike-slip faults.However,the distributions of carbonate reservoirs and hydrocarbons along the fault zones is extraordinarily complex,posing challenges for well deployment and efficient petroleum development.Taking the FⅠ17 hydrocarbon-rich strike-slip fault zone as an example,a fine struc-tural analysis was conducted by using high-resolution seismic data.Coupling with core,logging and production data,the reservoir distribu-tion and its controls on hydrocarbon accumulation were investigated.The results show that the FⅠ17 strike-slip fault zone can be divided in-to five segments from south to north:parallel en echelon segment,linear segment,superimposed segment,oblique superimposed segment,and horse-tail segment.The distribution,scale,and type of strike-slip faults govern the reservoir distribution and development.From the parallel en echelon segment to the oblique superimposed segment,the fault development intensifies,resulting in larger and more intercon-nected reservoirs.Conversely,the horse-tail segment in the north features reservoirs distributed along branch faults with poor connectivity.The fault-controlled hydrocarbon reservoirs in the FⅠ17 strike-slip fault zone can be classified into four types:linear fixed-volume,connect-ed superimposed,superimposed fault-block,and tail-end dispersed.The type and scale of strike-slip faults control the reservoir types and hydrocarbon enrichment levels,necessitating targeted drilling strategies for different fault-controlled reservoir types.
Tarim basinOrdoviciancarbonate rockstrike-slip faultfault segmentationfault-controlled reservoirfault control on hydro-carbon accumulation
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