scholarly journals Lacustrine Carbonate Reservoir Characteristics Research of Jurassic Da’anzhai Member in North Central Sichuan Basin

2015 ◽  
Vol 8 (1) ◽  
pp. 398-404 ◽  
Author(s):  
Du Jiangmin ◽  
Zhang Xiaoli ◽  
Yu Yanqiu ◽  
Huang Kaiwei ◽  
Guo Hongguang ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Physical Property ◽  
Lower Jurassic ◽  
Carbonate Reservoir ◽  
North Central ◽  
Reservoir Characteristics ◽  
Control Factors ◽  
Reservoir Development ◽  
Lacustrine Carbonate ◽  
Central Sichuan Basin

Based on both macroscopic and microscopic characteristics of cores from Lower Jurassic Da’anzhai Member in north central Sichuan Basin, and combined with physical property data, a detail study has been conducted, which includes reservoir characteristics such as lithologic characters, physical properties, and reservoir space types, and control factors of reservoir development. The study suggests that, there are two typical kinds of reservoirs: crystalline shell limestone and argillaceous shell limestone. The reservoirs properties are poor with ultra-low porosity and low permeability, which can be significantly improved by fractures. Reservoir space type is pore-fracture, mainly constitutive of the micro-fractures accompanied by dissolved pores. The reservoir development is controlled by sedimentation, diagenesis and tectogenesis together. Shell beach and lacustrine slop are the favorable facies for reservoir development. Dissolution is the primary constructive diagenesis to improve reservoir porosity and permeability. Structural fractures are necessary for reservoir effectiveness and high production.

Differential diagenetic evolution and hydrocarbon charging of the tight limestone reservoir of the Da’anzhai Member in the central Sichuan Basin, China

2020 ◽  
Vol 8 (4) ◽  
pp. T1007-T1022
Author(s):  
Jiao Su ◽  
Zepu Tian ◽  
Yingchu Shen ◽  
Bo Liu ◽  
Qilu Xu ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Large Scale ◽  
Depositional Environments ◽  
Carbonate Reservoir ◽  
Source Rocks ◽  
Petroleum Exploration ◽  
Porosity Reduction ◽  
Hydrocarbon Charging ◽  
Pore Evolution ◽  
Central Sichuan Basin

The tight lacustrine carbonate reservoir of the Da’anzhai Member, Lower Jurassic Ziliujing Formation, in the central Sichuan Basin is a typical tight oil reservoir, and it is one of the crucial petroleum exploration targets in the Sichuan Basin. The porosity of the limestone ranges from 0.5% to 2%, and the permeability ranges from 0.001 to 1 mD. The Da’anzhai limestone experienced multiple diageneses, including compaction, cementation, dissolution, and recrystallization. Different diageneses occurred in the burial process due to the various fabrics and depositional environments, eventually forming distinct rock types; therefore, the pore evolution and hydrocarbon charging characteristics are inconsistent. In our research, there are two stages of major maturation and hydrocarbon expulsion in the source rocks of the Da’anzhai Member. The first large-scale expulsion of hydrocarbon is oil-based and gas-supplemented, whereas the second expulsion is dominated by gas. Hydrocarbon-filling characteristics are different in different types of reservoir rocks. Compared with the bioclastic grainstone and crystalline limestone, we have considered that the argillaceous shell packstone and bioclastic packstone deposited in the shallow and semideep lake environment still contain residual intergranular pores, which have not become fully compacted and are partly filled with hydrocarbons. The presence of hydrocarbon fluid hindered the secondary porosity reduction and was helpful for reserve space preservation.

scholarly journals Control factors of high and stable production of Jurassic Da'anzhai Member tight oil in central Sichuan Basin, SW China

2017 ◽  
Vol 44 (5) ◽  
pp. 866-875 ◽  
Author(s):  
Guang YANG ◽  
Dong HUANG ◽  
Pinghui HUANG ◽  
Weipeng YAN ◽  
Tianquan YANG ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Tight Oil ◽  
Sw China ◽  
Control Factors ◽  
Stable Production ◽  
Central Sichuan Basin

Tight Carbonate Microstructure and its Controls: A Case Study of Lower Jurassic Da'anzhai Member, Central Sichuan Basin

2020 ◽  
Vol 94 (2) ◽  
pp. 305-321
Author(s):  
Bo LI ◽  
Xingzhi WANG ◽  
Hongqi LIU ◽  
Yongjun WANG ◽  
Jie TIAN ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Lower Jurassic ◽  
Tight Carbonate ◽  
Central Sichuan Basin

The Characteristics of X Formation Biohermal Reservoir in DMP Structure in Sichuan Basin

2014 ◽  
Vol 962-965 ◽  
pp. 138-141
Author(s):  
Jiang Min Du ◽  
Xiao Li Zhang ◽  
Chao Li ◽  
Yan Qiu Yu ◽  
Xi Zheng ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Pore Space ◽  
Physical Property ◽  
Sedimentary Facies ◽  
Control Factors ◽  
Drilling Data ◽  
Crystalline Dolomite ◽  
Formation And Evolution ◽  
And Control ◽  
Research Show

Based on the logging and drilling data of DMP structure in Sichuan basin.We study the characteristics and control factors of biohermal reservoir of X formation deeply. The research show that the biohermal reservoir is comprised of biohermal dolostone and fine-medium crystalline dolomite mainly;Intergranular pore,dissolved cave and pore space are mainly kinds of reservoir space;The physical property of the reservoir is not very good,with the low porosity and low permeability.Fractures grow well in reservoir, forming a kind of fractured reservoir.The formation and evolution of the reservoir is controlled by the sedimentary facies, tectonization and diagenesis.

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