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Study On Characteristics Of Deep Structure In Central Xujiaweizifault Depression

Posted on:2013-02-02Degree:MasterType:Thesis
Country:ChinaCandidate:Y ChiFull Text:PDF
GTID:2210330374465793Subject:Mineral prospecting and exploration
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The work in recent years shows us that the deep of Songliao Basin is rich in natural gasresources, Xujiaweizi fault depression is the most important gas-bearing fault depression inthe northern of Songliao basin. Especially deep volcanic gas reservoir was discovered day byday, and it already become a main field of natural gas exploration. But the development ofthe deep exploration is limited, which was the result of the complex structure of faultdepression, no enough in-depth studies of the effect of structure and fracture on the GasAccumulation and similar problems. This paper use of recent theories and methods ofgeology, seismology, geophysical logging, and combined previous research achievementsto launched research by adventurous idea and view of structure interpretation, the structuralcharacteristics of the block were studied in detail, and the formation and evolution ofXujiaweizi fault depression has been analyzed in this treatise, in order to guide research thecharacteristics of deep layer natural gases in this area.The Deep formations mean the formation under the Quantou second member formationin central Xujiaweizi fault depression,they are mainly included upper Jurassic—lowerCretaceous fault depression structural and Lower Cretaceous Depression structural. There arethree sets of volcanic rocks that is Houshiling, Yingcheng first member and third member incentral Xujiaweizi fault depression, Xuzhong fault control the eruption and distribution ofYingcheng first member volcanic rocks, and xudong fault belt control the eruption anddistribution of Yingcheng third member volcanic rocks, and this two formations main showtwo sets of volcanic built in central fault depression. There are also three sets of source rocks,which are Shahezi, Yingcheng fourth member and Denglouku second member and thirdmember. Early faults had been active during Shahezi Formation, Yingcheng Formation, mostof this faults had been stop active at the end of Yingcheng Formation, but Later tectonicmovement influenced,so that some of the fault recovery activities and have certaininheritance.In this area, the formation and development of volcanic rocks and structural belthas close relationship with fault activity, and gas migrated upward along these faults andaccumulation. This fault depression deep tectonic framework are controlled by nearlynorth-west Xuzhong fault, nearly south-north Xuxi fault, nearly north-west Xudong fault beltand four groups of nearly north-east fault,and created the present complex tectonicframework with characteristic, which is different segmentation from south to north, variouszones from east to west,alternating with protruding and sunken belt. The study of Platetectonic movement and Moho-discontinuity changed by mantle upwelling, explained the formation and evolution of fault depression, decide to divide fault depression into six stages.Then analysis and summarize about gas reservoir distribution feature, main factor, gasreservoir type and migration mode about further study, Xujiaweizi fault depression had aoptimal matching relation of "Generation, Reservoir,cap rock, entrapment,migration,preservation" in time and space, thus created good geological conditions for generation ofdeep natural gas reservoir.
Keywords/Search Tags:Xujiaweizi fault depression, structural characteristics, fault, deep naturalgas reservoir
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