陆相湖盆页岩油储层形成演化过程与成因机制
项目来源
项目主持人
项目受资助机构
立项年度
立项时间
项目编号
研究期限
项目级别
受资助金额
学科
学科代码
基金类别
关键词
参与者
参与机构
项目受资助省
项目结题报告(全文)
1.Occurrence, Genesis, and Significance of Analcime in Fine-Grained Sedimentary Rocks
- 关键词:
- GREEN RIVER FORMATION; MINERAL REACTIONS; UINTA BASIN; ORIGIN; LAKE;MEMBER; ZEOLITIZATION; DIAGENESIS; PETROLEUM; MEXICO
Natural analcime, an aluminosilicate mineral with multiple genetic mechanisms, widely occurs in fine-grained sedimentary reservoirs rich in oil and gas. Researchers have discussed the source and formation mechanism of reservoirs and the influence of morphology formation, occurrence characteristics associated with minerals, geochemical data, and Si/Al ratio on reservoir properties. The occurrence location, particle size, automorphism, purity, and fracture development can indicate the source of analcime macroscopically. The correlation between the enrichment of associated minerals and the content of analcime indicates that the associated mineral assemblage or correlation provides a material source for the formation of analcime or effectively improves the formation environment. Geochemical data are often used to identify analcime related to primary magmatic crystallization and hydrothermal processes. The genetic source grouping scheme based on the Si/Al ratio, which is a traditional means to identify the source of analcime, has been widely used in the research on analcime. After more than 200 years of study, research has shown that analcime distributed in fine-grained sedimentary rocks was mainly formed by burial alteration of volcanic materials (V-type analcime), conversion of nontuffaceous materials (N-type analcime), hydrothermal deposition mineralization (H-type analcime), and precipitation directly from an alkaline lake or pore water (P-type analcime). Based on reservoir properties, analcime that formed before the organic acid release stage of source rocks can effectively improve the porosity through precipitation-dissolution mechanisms after the release of massive organic acid, whereas the cementation formed by the transition of the fluid from acid to alkaline during the intermediate diagenetic stage would reduce porosity to some extent.
...2.Applications of Light Stable Isotopes (C, O, H) in the Study of Sandstone Diagenesis: A Review
- 关键词:
- light stable isotopes; carbonate cements; quartz cements; clay minerals;sandstone diagenesis;CRETACEOUS QUANTOU FORMATION; SOUTHERN SONGLIAO BASIN; PORE-WATEREVOLUTION; OXYGEN-ISOTOPE; CARBONATE CEMENTS; QUARTZ CEMENTATION;NORTH-SEA; CHEMICAL-COMPOSITION; FLUID INCLUSIONS; C-13-O-18 BONDS
This article reviews the applications of light stable isotope, including carbon, oxygen and hydrogen, in the studies on origin and formation temperature of authigenic carbonate, quartz and clay minerals. Theoretical knowledge and analytical methods for major light stable isotopes are introduced in detail. Negative and positive C-13 values indicate significant differences on the origin of carbonate cements. The O-18 value is an effective palaeotemperature scale for authigenic minerals formation. Various fractionation equations between O-18 and temperature are proposed for carbonate cements, quartz cements and clay minerals, whose merit and demerit, applicable conditions are clarified clearly. Clumped isotope analysis can reconstruct the temperature of carbonate precipitation with no requirement on the O-18 of initial waters, which makes temperature calculation of carbonate cements formation more convenient and accurate. Hydrogen and oxygen isotopes mainly reflect the origin of diagenetic fluid for clay mineral formation, providing reliable evidence for diagenetic environment analysis. This work aims at helping researchers for better understanding the applications of light stable isotope in sandstone diagenesis.
...3.Biomarker signatures of Sinian bitumens in the Moxi Gaoshiti Bulge of Sichuan Basin, China: Geological significance for paleo-oil reservoirs: Reply
4.Biomarker signatures of Sinian bitumens in the Moxi Gaoshiti Bulge of Sichuan Basin, China: Geological significance for paleo-oil reservoirs: Reply
