【摘要】：以明確華北地臺中奧陶世沉積格局分布及演化特征為目的,基于層序地層學(xué)理論,將華北地臺東部中奧陶統(tǒng)劃分為5個三級層序,并以三級層序?yàn)閱挝贿M(jìn)行沉積相分析和巖相古地理編圖。從層序地層的等時性出發(fā),研究了本區(qū)中奧陶世巖相古地理特征。華北地臺東部中奧陶世以持續(xù)海侵為主,層序地層的發(fā)展受海侵規(guī)模、時間及短暫海退的影響,中部地層發(fā)育最為齊全。古地理格局總體上表現(xiàn)為南北高、中間低,早期至晚期演化具有一定的繼承性和明顯的發(fā)展性。古地理環(huán)境受構(gòu)造和海平面變化綜合作用的影響,隨著海侵?jǐn)U大,云坪沉積減少,局限臺地和開闊臺地占據(jù)絕對優(yōu)勢。各期沉積相的分布格局有所差異,但整體而言,繼承性明顯,南北兩側(cè)的隆升格局造成南北分化顯著,沉積相帶南北對稱,開闊臺地常為南北兩側(cè)的局限臺地所夾持,反映了構(gòu)造隆升背景下沉積環(huán)境對海平面變化的敏感性。沉積過程的多旋回性和巖性組合的韻律性使得中奧陶統(tǒng)形成了多套有利的生儲蓋組合,中新生界保存條件較好的渤海灣盆地區(qū)為有利勘探區(qū)。
[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、圈閉評價方法與關(guān)鍵技術(shù)”(2016ZX05001003)聯(lián)合資助
【分類號】：P618.13;P534.42

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