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Reservoir Characteristics Research: Tight Sandstone Reservoir Of Denglouku Formation In Changling Fault Depression

Posted on:2015-02-14Degree:MasterType:Thesis
Country:ChinaCandidate:H M XueFull Text:PDF
GTID:2180330431994962Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
Changling Fault Depression is located in the nouth of the central fault belt in Sorthernpart of Songliao Basin, one of the biggest fault depressions in basin. With the growingdemand for natural gas resources, tight sandstone reservoir is increasingly brought to theattention of the people. Because of the limit of geological and reservoir conditions,exploration and development of the deep tight sandstone reservoir in Changling FaultDepression is limited. This paper complex mud logging, well logging, core and seismic data.Study the developmental characteristics of Denglouku Group in Changling Fault Depression,and analyze the main controlling factors for the development of quality reservoir, and forecastthe high quality reservoir development area.The main rock types of Denglouku Formation in Changling Fault Depression arefeldspar debris sandstone and debris feldspar sandstone. The reservoir consists of lowcompositional maturity and low structure maturity. It suggests that the sedimentaryenvironment has strong energy, the study area is closed to mother rock zone, the movingdistance is short. From north to south, granularity of each tectonic unit gets coarse. Themain cement types are carbonate and argillaceous. Reservoir of Denglouku Formation inChangling Fault Depression generally belongs to low porosity low permeability-middleporosity low permeability. Longitudinal exist two abnormally highly porous zones, which arein1900~2300m and3400~2300m deep. In the plane, the maximum porosity andpermeability are in central and southern regions in the east of Changling Fault Depression,near by Dongling slope and Changling deep concave. Reservoir space types of DengloukuFormation in Changling Fault Depression are mainly secondary pores and cracks. Cracks aremainly distributed in the southeast of study area. Diagenesis includes compaction,cementation, quartz and feldspar authigenic increase, metasomatism and dissolution, etc.Diagenetic stages are A2of middle diagenetic stage and B of diagenetic stage. Diageneticfacies are dissolution diagenetic facies, dissolution and part of cement diagenetic facies andtight compaction diagenetic facies.This paper, evaluates the reservoir of Denglouku Formation in Changling FaultDepression with weight evaluation method. Most of the reservoir of Denglouku Formation inEastern part of Changling Fault Depression has good adsorption capacity. Reservoir types aremainly II and III. Yaoyingtai nose-like structure belt, Daerhan nose-like structure belt andShuanglong nose-like structure belt have better comprehensive evaluation, reservoir type is II.The place between Qianji nose-like structure belt and Shuanglong nose-like structure belt hasworse comprehensive evaluation, reservoir type is III.
Keywords/Search Tags:Changling Fault Depression, Denglouku Formation, tight sandstone, highquality reservoirs, favorable area
PDF Full Text Request
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