塔里木盆地顺北地区中部低序级走滑断裂全方位一体化勘探实践OA

In the central Shunbei area of the Tarim Basin,low-order strike-slip faults situated between major faults are identified as the destination of hydrocarbon migration and enrichment,exhibiting favorable conditions for hydrocarbon accumulation.However,hydrocarbon exploration targeting these faults faces both geological and engineering challenges.Geologically,the developmental mechanisms of the low-order faults remain poorly understood,complicating their effective identification and fine characterization.Regarding engineering,well drilling and completion operations proves prolonged and costly.To address these challenges,we implement all-round exploration practice that integrates research and deployment,geology and geophysics,exploration and exploitation,geology and engineering,and technology and economy.These integrated practices have effectively enhanced the efficiency and benefits of exploration targeting low-order faults in the central Shunbei area.The geology-geophysics integration facilitates the establishment of an interpretation mode of low-order faults.This mode improves the integrity of the diffraction wave-based sampling of small faults using small-bin and wide-azimuth(WAZ)acquisition techniques.Furthermore,it enhances the energy and signal-to-noise ratios of signals from ultra-deep strata in deserts through high-fold coverage.Consequently,a breakthrough is achieved in the seismic identification of low-order faults,transforming them from previously undetectable to clearly identifiable.The exploration-exploitation integration allows three-dimensional analysis of drilled wells and iterative optimization of reservoir models.In combination with detailed characterization,a well trajectory design technique is developed.This technique is distinguished by its ability to control faults using a single well,select optimal anomalous targets in the central portions of fault planes horizontally,select optimal cave reservoirs vertically,and identify multiple barrier-shaped hydrocarbon reservoirs along fault zones.The exploration-exploitation integration provides robust support for efficient oilfield development with fewer wells,high single-well production,and direct transformation of exploratory wells to production wells through holistic planning.The geology-engineering integration enhances the accuracy of geostress prediction and drilling-related geological risks,while also enabling the optimization of integrated wellhead and casing programs.As a result,this integration facilitates the safe,precise,and quick landing of wells in the pay zones of the low-order faults.The technology-economy integration drives the optimization and cost reduction at source for the entire chain comprising seismic acquisition,well drilling,logging,and acid fracturing,thereby enhancing exploration quality and economic benefits.These exploration practices demonstrate that low-order fault zones represent significant targets in ultra-deep hydrocarbon exploration.Despite their relatively low activity intensities,low-order strike-slip fault zones exhibit dense fracture networks,which can induce extensive reservoir fracturing,conducive to hydrocarbon storage and migration.Beyond major fault zones,we quickly identify low-order faults with the potential for a reserve growth of up to 100 million tonnes.This facilitates breakthroughs made in new-type hydrocarbon exploration,expanding horizons for hydrocarbon exploration.