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Geoburried-hills Reservoir Characteristics And Forming-mechanism In Chexi Area

Posted on:2008-02-08Degree:DoctorType:Dissertation
Country:ChinaCandidate:S Y LiangFull Text:PDF
GTID:1100360218463201Subject:Geological Resources and Geological Engineering
Abstract/Summary:PDF Full Text Request
Seriously anisotropy of carbonate paleo-urial hill restraint exploration of buried hill hydrocarbon reservoir, intensely researching its reservoir characteristic and controlling factor will be favour of deepening theory understanding and guide further prospecting work. By means of balanced cross section, sequence stratigraphy, reservoir characteristics, tectonic stress analysis technique and approach, guided by tectonic geology, reservoir geology, organic geochemistry, the text apply comprehensively seismic, bore, log, geochemistry, testing, exploit to analyze formation of burial hill, recover structural history, establish depositional model of sequence stratigraphy, analyze distinct diagenesis, characteristics, identifying space type, comprehensive evaluation of paleoburial hill reservoir. Above all, researching controlling factor of accumulating space development, establishing geological model of paleoburial hill reservoir, probing into formation mechanism of paleoburial hill reservoir, analyzing reservoir distributing forecast beneficial reservoir. The main understanding are: 1.the reservoir experience six diagenesis and is divided into syndiagenetic stage, early diagenetic stage, epidiagenetic stage and after diagenetic stage; 2. the accumulating space of burial hill reservoir is classified into 11pore space and 5 split, the reservoir is divided into split-cave, compound cavity, split, corrosion cavity accumulating mode; 3.analyzing and expounding accumulating space development and controlling factor of Tao Er River burial hill, Che Gu 53 burial hill and decollement burial hill in the actic region, pointing out reservoir aggregative model in the west of CheZhen depression and accounting karstification is the main genesis mechanism of burial hill reservoir in the lower Palaeozoic and lithologic character and fault decide formation and development of inside burial hill reservoir; 4. the development characteristics of burial hill reservoir are:(1)The reservoir is generally developed in weathering crust karst zone; (2) The weathering crust karst zone has bad selective with the lithology and horizon;(3) The distribution of the weathering crust karst zone is controlled by antithetic faults;(4)The development of valid reservoir inside buried hill is controlled by step faults;the vertical distribution of reservoir is very complex. Through the reservoir evaluation, the Fengshan formation , Yeli-Liangjiashan formation and Batu formation is the best , the second is up , lower Majianggou formation ; the reservoir character in southern gentle slope is much better than the northern actic region . The reservoir is most developed in the prominent in uplifted wall of antithetic faults in southern gentle slope , the second place is residual hill in slow Palaeozoic ; The residue reservoir is very developed in the buried hill prominent in northern actic region second step , the reservoir inside the buried hill is very developed in the place that the activity of two step faults is very acute .
Keywords/Search Tags:Chexi area, buried hills, carbonate, reservoir characteristics, formation mechanism
PDF Full Text Request
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