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Characteristics of Tight Oil Reservoir of Lacustrine Carbonate Rocks of Buxin Formation in Sanshui Basin of Central Guangdong Area, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第04期
Page:
724-734
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics of Tight Oil Reservoir of Lacustrine Carbonate Rocks of Buxin Formation in Sanshui Basin of Central Guangdong Area, China
Author(s):
TANG Xin-ping
(Research Institute of Exploration and Development, Dagang Oilfield Company, CNPC, Tianjin 300280, China)
Keywords:
tight oil;  lacustrine carbonate rock;  Buxin Formation;  reservoir;  lithology;  source-reservoir allocation relation;  Sanshui Basin;  Guangdong
PACS:
P618.13
DOI:
10.19814/j.jese.2020.08043
Abstract:
In order to study lithology, physical property and source-reservoir allocation relation of lacustrine carbonate rocks of Paleogene Buxin Formation in Sanshui Basin of central Guangdong area, the logging, core description, thin section identification, X-ray diffraction(XRD)and scanning electron microscope data were comprehensive used to analyze the lithology and oil-gas potential; combined with the porosity and permeability analysis, and micro CT scan test, the physical properties were analyzed; combined with the source rock data of Buxin Formation, the source-reservoir allocation relation was analyzed. The results show that carbonate rocks mainly include muddy limestone, dolomitic muddy limestone, micrite limestone, micritic arenaceous limestone and biological limestone, the lithology is fine in general; carbonate rocks are distributed in the lakeside and shallow lake on the both sides of lake basin, the lake basin gentle slope is generally taken as the basement, and the mudstone and carbonate rock are intercalated; the porosity of carbonate rock is 2.8%-9.6%, and the permeability is generally less than 1 mD; in the tight reservoir, the reservoir spaces are composed of fractures, micron matrix pores and a few dissolution pores, which form two pore structures, including matrix pore-fracture type and dissolution pore-fracture type; oil is commonly found in pores and fractures, and oil-gas display is generally active with the oil stain-oil spot display level; the total organic carbon(TOC)of dark mudstone formed in shallow-semi deep lakes is 1%-2%; dark mudstone and carbonate rock with high abundance overlap each other, forming a good source-reservoir allocation relation. The preliminary evaluation of reservoir shows that the micritic limestone, micritic arenaceous limestone and biological limestone distributed in the shallow lake have high mineral content, continuous distribution, relatively good reservoir physical properties and good source-reservoir allocation relation, and are potential favorable reservoirs.

References:

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Last Update: 2021-04-20