| This paper is focus on the middle Triassic Lei Kou-po formation in Si Chuan,basin southwest, China. Mainly around the part of Lei Kou-po carbonate source rockscharacteristics and source rocks-natural gas trace. Combine results with actual facts,according to the research needed to obtain the raw data, data collection, samplecollection and laboratory analysis stage research and other works.It showed good oil and gas in the whole basin in Lei Kou-po formation. As far,three gas fields have been found. There are Zhong Ba gas field in west of Si Chuanbasin, Mo Xi gas field in middle of Si Chuan basin and Wo Long River gas field ineast of Si Chuan basin. Two gas-bearing structures, Guan Ying Chang and Luo DuXi structures. Several industrial gas flow d isplays. For example, Western Sichuandepression, Yuan Ba district in Guangyuan and LongGang in the fourth member ofLei Kou-po.Sichuan Basin in Triassic sedimentary evolution Lei Kou-po stage belongs toIndo-China movement. Located in the southeast of the Yangtze plate Jiangnan upliftof cratonic basin with terrigenous supply plays a dominate role. And control of thedevelopment of sedimentary facies distribution. From Longmen Moutain in thenorthwest to southeast Jiangnan uplift followed by development with slopes-basins,platform edges,confined or semi-confined mesa,tidal flat facies in whole basin. Ininternal development platform, there are have platform margin beaces, lagoogs,setsthe beach,tidal flat facies and so on. The overall performance of the “three uplift anddepression”.The main source rocks studied by the Sichuan Basin tectonic evolution of thesystem summary and analysis of the middle Triassic period. At the same time, itcontains sedimentary characteristics, sedimentary environment and sedimentary facies.To identify and characterize Leikoupo plane distribution of hydrocarbon sourcerocks. Combined with previous geochemical data and sample analysis data,summarize the whole basin carbonates, summarize the whole basin carbonatesLeikoupo type of hydrocarbon source rocks,organic matter abundance, orga nicmaturity and other characteristics,evaluation leikoupo source rock distributioncharacteristics and laws of the whole basin. Though works what mentioned abouthave made some new results.Leikoupo source rocks longitudinal little change on the organic carbon content.the value in the four member of leikoupo relatively high. plane distribution between0.1%~0.4%. Moxi in Sichuan region-tongnan area, eastern sichuan’s wolong river,and Long Gang district,the higher the content areas in western sichuan depression.the value more than0.3%,the other place is less than0.3%.The source rock thickness varies between0~480m,in generally between 100~250m.Yanting~Dayi, thicker area in western Sichuan Depreesion,Luzhou,Kaijiang palaeuplift and other regions of the northern section of theLongmen thinner and more less than100m. has been eroded and exhausted in LuZhoupalaeohigh formations along Leikoupo.The Ro maturity value distributed between0.96%~2.51%in Leikoupo. the stageof evolution is in mature–over–mature. On the same longitudinal section,Ro valueof the difference between its top and bottom of about0.1%to0.5%.plane Leikoupodistribution of source rocks in the Ro value distributio n from0.9%to3.1%.The value of Ro in western basin–north–northeast sedimentary depressions ismuch at1.5%.Reached a high stage of maturity to over mature. central and southernrelatively low, Ro mostly between1.0%to1.3%in the mature stage.Currently reaction parameters parent material sources, such as, kerogen carbonisotope, kerogen element, organic petrology (including identification and analysisunder the microscope kerogen).Group composition of organic matter.Biomarkerfeatures such as consolidate statement Minglei mouth slope group of organic mattertype II1~II2,sapropel-humic.Hydrocarbon intensity changes Leikoupo between20×108m3/km2~40×108m3/k--m2.Kaijiang luzhou paleo-uplift and north western in basins are relatively lowintensity. East edge hydrocarbon basins in the central and western intensity isrelatively high. The total amount is415.400×1012m3,resources is ranges from18693×108m3to39463×108m3。Has great exploration potential.In the aspect of gas–resource contrast, According Leikoupo natural features,including gas composition,carbon isotope,hydrogen isotopes,noble gasisotopes,And lower Permian longtan formation shale (coal)rocks,overlying Xujiahecarry gas source.with typical gas reservoir, summary leikoupo gas mainly mature–high mature mixed-source gas,followed by coal gas mature. These types of genetictypes of natural gas constitutes the main part of the leikoupo capacity. leikouposources of natural gas with multi-source feature. The main system for hydrocarbonlayers were upper Triassic Xujiahe coal-bearing strata, upper Permian coal-bearingsource rocks and leikoupo their source rocks. Leikoupo sources of natural gas withmulti-source feature. The main system for hydrocarbon layers were upper TriassicXujiahe coal-bearing strata,upper Permian coal-bearing source rocks and leikoupotheir source rocks.Sichuan basin leikoupo sufficient material basis for natural gas explorationdegree is still low, with a large exploration prospects,the future may acquire promisinghuge breakthrough. |
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