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۱Investigation on Sedimentary and Depositional Environment Usage of Cretaceous in South–East of Golpayegan Region
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس سراسری الکترونیکی محیط زیست و انرژی ایران، سال
تعداد صفحات: ۸
In this investigation the facies and their usage in the environment of cretaceous rocks that crop out at 35 km south–east of Golpayegan is studied. The section with 811 m thickness is composed of compact, dark marly shale, shale dark sandstones, orbitolina–contained limestone, marly limestone and calcareous limestone of early cretaceous (Albian), and dark gray limestone marly limestone of late cretaceous ages. Field and microscopic (petrographic) studies lead to recognition of 7 carbonate and 2 clastic facies. Facies 1 (Bioclast lime mudstone) indicates medium open marine environments. Facies 2 (Bioclast wackestone). Facies 3 (Peloid wackestone), Facies 4 (Bioclast packstone),Facies 5 (Bioclast packstone), Facies 6 (Intraclast packstone) and Facies 7 (Lime mudstone) indicate shallow to medium (sub–tidal) inter–tidal and supra–tidal deposition. In some cases, such as Facies 8 (Lime mudstone) and Facies 9 (Sandstone) Facies refer to a clastic condition which has direct relationship with active tectonic periods. Meanwhile in normal cases, Facies 4, 5 and 6 Facies are representative of carbonate basin in shape of homoclinal ramp.<\div>

۲Determining of Source Rock and its Characteristics Using Organic Geo–Chemistry Derived from Parent Rock Evaluation, Separation, and Columnar and Gaseous Chromatography on Cretaceous Units in Central Iran at Khor–Biyabanak
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس سراسری الکترونیکی محیط زیست و انرژی ایران، سال
تعداد صفحات: ۱۱
Recently, the investigations made on rocks of cretaceous units at Central Iran have revealed source rocks and their characteristics (origin, amount, and type, maturation of organic material, hydrocarbure(Hydrocarbon) generation ability and sedimentary organic material environment). The information obtained from investigation and evaluation of cretaceous rock units at Khor–Biyabanak region using following methods have led to determining of the source rocks with some weak to medium organic material from the downstream to upstream of the section (underlying–intermediate cretaceous towards upstream cretaceous) in the region: 1– Evaluation of source rock, 2– Separation of Bitumen, 3– Columnar Chromatography & 4– Gaseous Chromatography. With due regard to the amounts of TOC, HI, Tmax, S1, S2, PI, EOM, HCS, SAT\ARO, CPI, Pr\Ph, pr\n–c17, ph\n–c18, and the ratios, graphs, and derived peak values, it can be claimed that the type of organic materials present in the source rocks are Classes II and III Kerogens. The maturation of existing organic material in the source rocks is high and shows approximately the ending oil generation window and last stages of Catagenesis (Katagenesis). The origin of the organic material is also a marine and continental mixture which currently is capable to generate humid and dry gas in the existing source rocks. Also, the formation environment of existing source rocks is regenerative, and quasi–regenerative–marine.<\div>

۳The Eocene – Oligocene Facieses and Sedimentary Environments in Sardarreh Area, Garmsar
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس سراسری الکترونیکی محیط زیست و انرژی ایران، سال
تعداد صفحات: ۱۱
This research studies the Eocene – Oligocene facieses and sedimentary environments have in Sardarreh, Garmsar. Field studies were conducted to achieve this goal. So, 95samples were taken from the studied section. Because of the similarity of the samples, 49samples were selected for the preparation of thin sections. For facies interpretation and providing sedimentary model(Carruzi, 1989 ( ،(Flugel, 2011) and naming of carbonate rocks (Dunham, 1962) ،(Folk, 1962) and (Chen, 2011) were used. Thin section consists of: skeletal elements, including(Mollusks, Brakiopoda, Akinoderma, Foraminifera, Algae, Ostracoda, Gastropods) and Non–skeletal particles(pelloidy, intra–clast), Quartz(grains of sand), Gloconite, Feldspar, Chert, Gypsum, Salt, Anhydrite and facies’s matrix are calcareous mud and micritic or Asparitic cement. These studies led to the identification and separation of 7carbonate and destruction facies that have deposited in 4 facies belt. Open marine facies includes: A1: Bio–clast pack stone. Barrier facies takes in: B1: Pelloid bio–clast grain stone. Pool facies holds: C1: Gypsi– ferrous marl, C2: Calcareous sandstone. Tidal facies zone comprises: D1: Sandy pelloid wack stone \ pack stone, D2: Sandy intra–clast wack stone \ pack stone and D3: Fenestral mudstone. Due to interpretation of these facieses and their environments, the ancient geographical situation of this area is characterized. This is a carbonate platform which is a kind of carbonate Rimmed shelf.<\div>
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