Devonian black shales that were deposited on the North American craton contain abundant Tasmanites cysts. Although these are typically flattened because of compaction, a small proportion of cysts is filled with diagenetic silica. The latter are spherical to ellipsoidal (0.1-0.5mm), and filled with chalcedony, microand megaquartz, and with single quartz crystals. Chalcedonic cyst fillings are pr...

Dolomite or calcite, quartz and kaolinite in various proportions were reacted at 250-300~ temperatures and pressures up to 90 bars in a hydrous environment. Reactions which approached completion produced talc, calcite, montmorillonite, anorthite (both metastable hexagonal and stable triclinic polymorphs) and the rare Ca-zeolite, garronite. These reactions are applicable to diagenesis, low-grade...

Abstract Nari Formation is considered as one of the most important oil and gas exploration targets. These fine-grained tight sandstone reservoirs face enormous challenges due to their extremely low matrix porosity permeability. Hence, in this regard, study was carried out collect high-quality data on petrophysical properties along with mineralogy microstructural characteristics diagenesis. The ...

Evaluation of tight oil reservoir properties is great significance to the exploration and gas in reservoirs. The Chang 1 Member Yanchang Formation Wanhua Area, Ordos Basin a new stratum for sandstone oil. lack understanding characteristics crude enrichment rules has seriously restricted efficient development resources this stratum. In study, area effects superimposed sand bodies, structures pal...

The Silurian Kepingtage Formation of Tarim Basin is an important deep clastic reservoir. Exploration practice shows that the reservoirs are generally characterized by extremely low porosity and permeability, exhibiting strong mineral composition physical property heterogeneities. study heterogeneity its effect on oil charge great significance to understanding migration accumulation in such thus...

This study utilizes instruments from the Curiosity rover payload to develop an integrated paleoenvironmental and compositional reconstruction for 65-m thick interval of stratigraphy comprising Hartmann's Valley Karasburg members Murray formation, Gale crater, Mars. The consists cross-stratified sandstone (Facies 1), planar-laminated 2), mudstone 3). Facies 1 is composed showing truncated sets c...

Abstract Natural fractures are not only the key to affect natural productivity of tight sandstone reservoirs but also one important factors control fracturing effect. If local strata affected by multistage tectonic movement and diagenesis, it will lead complexity fracture types characteristics, which makes difficult accurately identify fractures, thus, seriously development fractured In this pa...

Carbonate rocks are composed of carbonate minerals that chemically formed in the form solutions, and there organisms involved their formation. The limestone found around Lake Limboto is very interesting, because water lake freshwater while characteristic a marine environment. Diagenesis natural process sedimentary occurs from initial deposition until it reaches limit metamorphism will be formed...

Diagenetic dissolution of magnetic minerals has been widely observed in organic-rich sediments from many environments. Organic-rich sediments from the eastern Mediterranean Sea (sapropels), recovered during Leg 160 of the Ocean Drilling Program, reveal a surprising catalogue of magnetic properties. Sapropels, from all sites studied across the eastern Mediterranean Sea, are strongly magnetic and...