loading3. Shale Gas Reservoir Characteristics of China
The shale reservoirof China are widespread
Zhungaer Basin P-J
Tuha Basin
P-J
Songliao Basion KTarim basin �
Bohaiwan bay E
Ordos T
NorthChina
Pt-O
SouthChina
Z-T
?Two type：marine, continental ?distribution characteristics
Paleozoic marine shale in SouthChina
Paleozoic marine shale in NorthChina
Tarim basin: ?-O marine shale
Songliao basin:
Cretaceous lacustrine shale
Zhungaer basin: P/J1-2 laucstrine shale
Ordos basin: Triassic shale
Tuha basin:J1-2
???????（1）South Silurian System and Cambrian System
are the main target layers
South region Proterozoic -Paleozoic developed six sets of marine shale formation, wherein Silurian Longmaxi group and the Cambrian Qiongzhusi group shale has high organic matter content, high thickness, and great shale gas resource potential.
Southern Proterozoic -Paleozoic Stratigraphic HistogramSouth Marine Phase Shale OC and Thickness Table
Formation
TOC，%
Ro%
thicknessm100~200200~250100~500100~300150~400100~200
PermianDevonia
nsilurianordovacioncambrianSinian
龙潭组罗富组龙马溪奥陶系筇竹寺陡山沱
0.34~2.180.27~2.331.88~4.360.16~1.971.50~5.700.19~2.04
1.1~3.11.8~3.52.4~3.31.7~4.62.33~4.122.67~4.5
Geologic Assessment of shale gas Resources
Prerequisite: If the evaluation Basin (evaluation area) has similar oil and gas geological conditions with an analogue basin ( analog area) with clear formation conditions, the oil and gas richness of the two areas is the same.
Hydrocarbon generation and expulsion amount of hydrocarbon source rocks can be estimated
according to oil and gas organic cause theory, the mining factor can be multiplied to know the oil and gas recoverable resources of the study area;The relation between each factor and the oil and gas resource amount should be respectively calculated for different evaluation units in the oil and gas containing system space through detailed analysis of the study area, and finally, the oil and gas resource amount under different possibilities should be calculated.
General Evaluating MethodMethod of Analogue
Method of GeneticMethod of Statistical Analysis
Conclusion: the analogy method is adopted for studying evaluation of shale gas resources under the condition of low degree of exploration.
Different Types Basin of Resources Abundance 1probability （a）前陆盆地foreland basin 0.5100015002000250030004km3天然气资源丰度，108m3/10ResourcesAbundance108m3/104km350011（c）拗陷盆地depressed basin 00probability probability （b）克拉通盆地craton basin0.50.5100015002000250030004km3天然气资源丰度，108m3/108ResourcesAbundance10m3/104km350000100015002000250030004km3天然气资源丰度，108m38/103ResourcesAbundance10m/104km350000resources= resources abundance * basin areaAnalog method is used to calculate shale gas resource of China's major basins and regions
BasinAppalachianYangtze Region North ChinaSan Juan Basin Continental Basin of Western ChinaContinental Basin of Western ChinaMichigan basin
Typecraton basincraton basincraton basinforeland basin foreland basin depressed basin depressed basin
Area104Km2
2890605.270
AgeDS、DC、PKP、J
Total resources（106m3）1512013500054000728058310
Resources Abundance （108m3/104m3t）
540 1500 900 1400 833
508.5
K、ND
6000010200
1200 1200
?The shale gas resources of China's major basins and regions are 21.5～45×1012m3, median is 30.7×1012m3.
?Paleozoic shale gas resources are 2 times of Mesozoic erathem with south and northwest as the main plane distribution areas, Sichuan Basin, Paleozoic systems in Ordos Basin and the like are the main formations of shale gas exploration.