Font Size: a A A

The Oil And Gas Accumulation Regularity And Favorable Area Prediction Of The Second Oil Group In The Lower Xingouzui Formation, Xingou Area

Posted on:2016-06-18Degree:MasterType:Thesis
Country:ChinaCandidate:J Y ChenFull Text:PDF
GTID:2180330464461951Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
Xingou oil field is located in the qianjiang sag of Qianghan basin, southern near total mouth syncline south the inheritance of the ancient new groove on the slopes of fault belt, xingou tip group under section of jianghan basin is one of the main oil gas, southern sag have large exploration potential, but study the regional basic geology, lithology, lithofacies distribution rule, the reservoir characteristics and spatial distribution, favorable reservoir prediction, oil and gas accumulation and enrichment regularity of main control factors and deeper understanding is not enough system, especially for the understanding of the dense oil enrichment regularity in the southern part of the country also is insufficient, seriously affected and restricted the pace of exploration in the southern part of the country.This thesis mainly in petroleum geology, reservoir description, reservoir geology theory as the instruction, with the xingou tsui II oil under the new group as the research object, with core data, logging data, logging data, analysis of test data, seismic interpretation, production test data, on the basis of the comprehensive use of various research methods, and combining previous research results on new gully region under Ⅱ oil group to carry out the research of sedimentary facies, reservoir characteristics and control factors of research, the characteristics of hydrocarbon source rock distribution and oil source correlation research.According to the research conclusion system analysis in the study area reservoir types and characteristics, under the new Ⅱ oil group of oil and gas enrichment of favorable facies belt and distribution of oil and gas reservoir, to predict favorable reservoir and oil and gas enrichment regularity, provide theoretical basis for oilfield exploration deployment next.Through the system research mainly has the following understanding:1.Under the new Ⅱ oil group in shallow lake in argillaceous dolomite depression period sedimentary characteristics, are favorable for forming dense reservoir interval.Study area is carbonate deposits are controlled by palaeogeomorphology, lithology is mainly thick mudstone clip a thin layer dolomicrite, gray and middle dolomicrite and thin interbed of dark grey mudstone in different thickness or middle dolomite with middle mudstone thickness layers. The alternating layers in different thickness is the relatively high terrain area lithology exhibit features; And the transition area between the former two sedimentary thickness, namely the high part of the ancient terrain with the transition between the low-lying area, dolomite content is higher, main show is thick, gray dolomicrite thin layer of dark grey mudstone.2.According to the new groove area 4 all Wells cored Wells of the period of the core, thin slice careful observation and analysis of more than 200 exploratory well drilling data, determine the types of sedimentary facies in the study area for the shallow lake sedimentary facies types, which is suitable for plateau lake, shallow lake subfacies and limitations depressions, sand dam ping lake is divided into mudflat and a set of two microfacies, limited depression is divided into argillaceous depressions and cloud mass depressions, two types of microfacies.3.The study area are mainly dolomite reservoir, the main rock types include: dolomicrite, mud shale, dolomitic mudstone, argillaceous dolomite rock, mud paste, paste mudstone, siltstone, a total of seven kinds of lithology.Reservoir pore types are mainly primary pores and secondary pores and cracks.Through the common chip, cathodoluminescence and scanning electron microscopy (sem) to identify, the study area under the new Ⅱ oil group carbonate reservoir in the hole-extra low permeability reservoir.4.Controlling factors of reservoir comprehensive analysis, sedimentary environment and sedimentary facies are the main controlling factor of carbonate reservoir, diagenesis on reservoir damage and has a promoting effect, the types of cementation and dissolution. Compaction and dolomitization lower porosity and permeability of reservoir.Could improve the dissolution on reservoir porosity, improve reservoir physical properties.5.Hydrocarbon source rocks in the study area, the overall high organic matter abundance, organic matter type is given priority to with Ⅱ type 2, overall lower hydrocarbon source rock thermal evolution degree, the Ex Ⅱ oil group under the main body in the low mature thermal evolution stage. Oil source correlation analysis showed that the xingou area under the Ex Ⅱ crude oil group of low-mature oil, derived from the low mature source rocks, in the interval part with laoxin oil fields and tuoshi oil field crude oil has great difference.NE of near zongkou oblique direction in the study area, the hydrocarbon source rock maturity is relatively high, the generated oil and gas can be shipped by faults and conducting system composed of high permeable zone together to construct high part accumulation.6.The anatomical thought in the study area typical reservoir EN department structure is relatively low, mainly is the source of oil and gas reservoir direct docking or nearby unconventional hydrocarbon accumulation pattern. Roof area of central in the study area, belongs to the regular pattern of secondary migration accumulation. And in the southern study area into smaller probability.
Keywords/Search Tags:Qianjiang sag, The second oil group in the lower Xingouzui formation, Reservoir characteristics, Enrichment regularity, Reservoiring pattern
PDF Full Text Request
Related items