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Reservior Evaluation And Favorable Regions Prediction Of Penglaizhen Formation Of Shifang-Deyang-Guangjin Area

Posted on:2016-03-26Degree:MasterType:Thesis
Country:ChinaCandidate:Q S ZhouFull Text:PDF
GTID:2180330464961963Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
The tight-conventional sandstone reservoirs is an important and natural gas reservoirs and focusing on the development of shallow natural gas horizons in our countary which development at upper Jurassic Penglaizhen formation in the western Sichuan basin.Shifang-Deyang-Guangjin area is located in the middle of the North Slope to bring Western Sichuan Depression, its Jurassic oil and gas exploration and development and deployment of the next period. This area experienced a more complex diagenetic evolution, especially cementation severely damaged reservoir properties, resulting in reservoirs near tight-tight features. Thus, for the reservoir properties, this paper will use sedimentology, sedimentary petrology, sedimentary facies, logging geology, reservoir geology, oil and gas geology theory as the guiding ideology,and take full advantage of the plenty data in the study area such as physical properties, flakes, cores, logging, testing air superiority in the area of information on control of sedimentary facies distribution, with in-depth analysis of the advantages of diagenetic distribution, the main advantage of reservoir development factors and predict favorable area distribution.The sandstone reservoirs are mainly braided river delta sedimentary in Penglaizhen formation.The first Penglaizhen formation Subject to delta front facies, locally for the first sub-delta facies, delta front distributary channel sand thickness is small, but a higher degree of stacking, mainly in JP42, JP43 sand group; The second,third and fouth Penglaizhen formation were delta plain facies,which the second and fouth Penglaizhen formation were far shore delta plain distributary channel sand body is thick, mainly in JP13, JP15, JP37, JP38, JP39 sand group,the third Penglaizhen formation For coastal delta plain, split large river sand thickness, stacking higher degree, mainly in the JP23, JP25 sand group. The study area widely developed delta plain water distributary channel, delta front underwater distributary channel and mouth bar deposits are stacked vertically laminated sandstone, flat continuous distribution, good petrophysical conditions, with good sedimentary facies.The study area mainly developed lithic quartz sandstone, lithic sandstone.In the first Penglaizhen formation mainly was siltstone,and the second,third and fouth Penglaizhen formation mainly were fine sandstone,with the strong hydrodynamic conditions better sorting. Reservoir depth in the study area generally 1500-1800m, between the particles to the point-the main line of contact, the degree of compaction medium-strong.The study layer was wholly in the A stage of diagenesis. Cementation experienced a longer study area mainly in the cement pore mainly developed shale, siliceous, carbonate cementation type, which cemented the early mud flake, filamentous authigenic illite and "honeycomb" Iraq fudge layer mainly siliceous cement production in authigenic quartz and quartz overgrowth mainly carbonate cementation early calcite cement in the late stage calcite cementation of carbonate cements in iron-based; undergone complex cementation process, reservoir porosity, permeability decreases, reservoir pore types of secondary dissolution pores mainly flake type throat throat throat and micro-based; measured by a mercury reservoir study area curve pore structure found in the study area complex pore structure. Its parameters changed greatly, low median radius, expulsion pressure is high, the total effective porosity rock interconnected voids accounted for a relatively small, poor flow.With the logging diagenetic facies analysis method to establish the region diagenetic facies analysis, the use of geological modeling tools to analyze the region’s advantages diagenetic facies distribution characteristics. Study area mainly developed dissolution pores diagenetic facies, diagenetic dissolution pores porphyritic phase and dense phase and dense compaction diagenetic cementation diagenetic facies, which the main producing reservoir layer is a general diagenetic facies, diagenetic phase II, phase three diagenetic reservoir capacity poor, four diagenetic facies reservoir capacity is poor, mainly didn’t formed the basic industrial gas reservoirs.With the study of deposition, diagenesis about different factors on the reservoir properties of the control analysis:Strengths sedimentary facies is the foundation of good reservoir properties and development, favorable diagenetic facies are the key of good reservoir properties and development, but for prediction of favorable areas also need Gas Reservoir Characteristics considering its favorable geological factors. Research mere Shifang-Deyang-Guangjin region on the whole structure is more simple, the whole is north east, southwest of depression, structural gap of nearly 1000 m depth, source faults in the study area in the southwest region of the horse well and shallow-level fault and fracture system development, adequate hydrocarbon source, reservoir pressure leads to a larger source of natural gas migration into the reservoir can be relatively poor permeability reservoirs, some from Punta to Punta Sec able to hide. Shifang regional hydrocarbon source fault although less developed, but its relative Majing hydrocarbon source fault in the main reservoir of today are located in a higher position and structure; Deyang, mainly in the fault zone near the edge of the study area and the advantages of sedimentary facies with parts of a good oil and gas shows. According to the study area "Three " Control Reservoir characteristics, combined with the advantages of sedimentary facies, diagenetic facies and other comprehensive evaluation to determine the study area favorable zones in Punta period, mainly in the first and second Penglaizhen area which southwest of the study area near the well block and Majing areawith high structural position Shifang area in the third and fouth Penglaizhen area which mainly in the Majing area belong north -east of Deyang and Guangjin area.
Keywords/Search Tags:reservoir characteristics, main factors, reservoir evaluation, prospective areas, Penglaizhen area
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