華北地臺(tái)東部中奧陶世巖相古地理特征
[Abstract]:In order to clarify the distribution and evolution characteristics of sedimentary pattern in the Middle Ordovician in the North China platform, the Middle Ordovician in the eastern part of the North China platform is divided into five third-order sequences based on sequence stratigraphy theory. Sedimentary facies analysis and lithofacies paleogeography mapping are carried out in the third order sequence. Based on the isochronicity of sequence stratigraphy, the lithofacies and paleogeography of middle Ordovician in this area are studied. The Middle Ordovician transgression dominated in the eastern part of the North China platform. The development of sequence stratigraphy is affected by the transgression scale, time and temporary regression, and the central stratigraphy is the most complete. The paleogeographic pattern is generally high in the north and south and low in the middle. The evolution from the early to the late period has a certain inheritance and obvious development. The paleogeographic environment is affected by tectonic and sea level changes. With the expansion of transgression, the Yunping sediments decrease, and the confined and open platforms occupy the absolute advantage. The distribution pattern of sedimentary facies varies from stage to stage, but on the whole, the inheritance is obvious. The uplift pattern on both sides of the north and south causes the differentiation between the north and the south, and the sedimentary facies belt is symmetrical to the north and south, and the open platform is often held by the limited platform on both sides of the north and south. It reflects the sensitivity of sedimentary environment to sea level change in tectonic uplift background. The polycyclicity of the sedimentary process and the rhythm of the lithologic assemblage have led to the formation of several favorable assemblages of the source reservoirs and caprocks in the Middle Ordovician and the favorable exploration area in the Bohai Bay Basin where the Mesozoic and Cenozoic strata are well preserved.
【作者單位】： 山東科技大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目“沁水盆地煤層氣與致密砂巖氣共生成藏機(jī)理研究”(41172108) 國(guó)家重大專項(xiàng)“十三五”課題“中深層煤系地層立體勘探有利目標(biāo)優(yōu)選”(2016ZX05041005)和“巖性地層油氣藏區(qū)帶、圈閉評(píng)價(jià)方法與關(guān)鍵技術(shù)”(2016ZX05001003)聯(lián)合資助
【分類號(hào)】：P618.13;P534.42
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