遥感图像上复杂地质模式的计算机辅助解译

本文介绍了一种用于辅助遥感图像地质解译的方法概况,所开发的方法是应用数学形态学对分类图像进行分析的技术。为了说明有关这类辅助解译的两种处理方法,使用了某一地质褶皱实例。     

Biostratigraphy,Depositional and Diagenetic Processes in Carbonate Rocks from Southern Lebanon: Impact on Porosity and Permeability

Carbonate rocks contain prolific hydrocarbon reserves all over the world, particularly in the Middle East. For exploration and production strategies, it is essential to understand carbonate reservoirs in terms of their internal characteristics, depositional environment, relative age, diagenetic processes and impact on petrophysical properties. This study has been performed on exposed Cretaceous, Paleocene and Miocene marine carbonate sedimentary sequences in two localities (Maghdoucheh and Qennarit) near the city of Sidon (Southern Lebanon). It represents the first comprehensive study that takes into consideration the carbonate reservoir facies, diagenetic history and reservoir quality in the area. Rocks at Maghdoucheh are mainly dominated by limestone beds showing sedimentary structures and erosive bases alternating with microfossil-rich silty marls, related to a shallowing upward sequence in a restricted marine platform environment. Shells of benthic foraminifera and mollusks dominate the fossil assemblage extracted from the studied rocks. The microfossil and nannofossil assemblage detected in the Maghdoucheh sections indicates a middle Miocene age. Rocks at Qennarit are composed of mudstone/wackestone limestone beds rich in planktonic foraminifera and nannofossils related to open marine conditions. Based on the nannofossil content, rocks from Qennarit 1 and 2 are Paleocene and Cretaceous in age, respectively. Four main types of microfacies have been identified, i.e. (1) microbioclastic peloidal calcisiltite, (2) pelagic lime mudstone and wackestone with planktonic microfossils, (3) grainstone/packstone with abundant foraminifera and (4) fenestral bindstones, mudstones and packstones with porostromate microstructures. The porosity-permeability (poro-perm) analysis of representative samples reveals moderate to good porosity but very low permeability. This is mainly due to the presence of large moldic pores that are isolated in nature. The diagenetic features are dominated by micritization and dissolution (both fabric selective and non-fabric selective). Among all diagenetic features, dissolution in both localities contributes to porosity enhancement, while micritization, cementation, compaction and the filled fractures have negative impacts on permeability; hence the overall reservoir quality.     

安徽南部燕山期中酸性侵入岩的源区锶、钕同位素制约

安徽南部燕山期中酸性侵入岩(年龄分别约为138Ma 和123Ma)的钕同位素初始比值∈_(Nd)(Ⅰ)值为—5——16.6,表明古老大陆地壳在这些岩石形成时起重要作用。江南的花岗闪长岩和花岗岩源区钕同位素组成与上溪群浅变质岩的原岩沉积物物源区相似。扬子系列的偏中性侵入岩则可能是幔源基性岩浆同化古老硅铝地壳物质的产物,但地壳物质占主导地位。     

DEVELOPMENT OF MESO-AND MICRO-SCALE STRUCTURES IN THE CHAMBA-BHARMAUR SYNCLINE, WESTERN HIMALAYA, INDIA

DEVELOPMENT OF MESO-AND MICRO-SCALE STRUCTURES IN THE CHAMBA-BHARMAUR SYNCLINE, WESTERN HIMALAYA, INDIA1　BholaAM ,LazarusDV .Kink banddevelopmentinthePukhriSlatesofChambaSyncline ,HimachalPradesh[J].JourGe olSocIndia ,1989,33,437～ 44 3. 2　HobbsBE ,MeansWD ,WilliamsPF .AnoutlineofStructuralgeology[J].JourWileyandSons ,NewYork ,1976 .5 71. 3　RamsayJG ,HuberMI .TheTechniquesofModernStructuralGeology[A].Volume .2 .FoldsandFractures…     

Chemical composition of fahlores of the Kupol gold - silver deposit

The chemical study shows that the Kupol fahlores are complex compounds with significant variations in their composition and the proportions of their constituent elements. Based on their major-element composition, they are subdivided into 3 species and several inter- and intra-species varieties. This testifies that the fahlores were formed under different physicochemical conditions.