本文選題：沉積結(jié)構(gòu)差異　切入點：碳酸鹽巖臺地邊緣　出處：《巖石學(xué)報》2017年04期

【摘要】：隨著研究的深入,逐漸認識到碳酸鹽巖臺地邊緣帶(簡稱臺緣帶)具有沉積結(jié)構(gòu)和演化的差異性,其不但記錄了古地理格局及其演化過程,同時也對相關(guān)油氣儲層的發(fā)育具有重要的影響。以四川盆地東北部早三疊世飛仙關(guān)期同期近平行的三排臺緣帶為研究對象,通過鉆井、野外露頭及地震等資料綜合分析,揭示研究區(qū)早三疊世飛仙關(guān)早期臺緣鮞粒灘帶明顯繼承了晚二疊世長興期臺緣礁灘帶的分布,并具有整體向東遷移的特點。不同臺緣帶之間具有明顯差異,可識別出遷移型和加積型兩種臺緣結(jié)構(gòu)樣式,遷移型臺緣帶主要分布在元壩-龍崗-梁平臺緣帶(簡稱1號臺緣帶)、簡池-雞王洞-沙陀臺緣帶(簡稱3號臺緣帶),其具有臺緣斜坡坡度緩、遷移明顯,造成臺緣帶鮞粒灘整體分布寬但厚度薄、橫向間互云化的特點;加積型臺緣帶主要分布在鐵廠河-普光-羅家寨臺緣帶(簡稱2號臺緣帶),沉積結(jié)構(gòu)總體上表現(xiàn)為加積特征,但晚期具有向東遷移特點,臺緣帶窄、臺前滑塌普遍,鮞粒灘分布集中且厚度大、云化徹底。不同臺緣帶內(nèi)部沉積和儲層分布具有差異性,1號臺緣帶內(nèi)部具有斜坡帶陡緩相間,緩坡區(qū)臺緣帶鮞粒灘遷移明顯,鮞粒灘累積厚度薄且云化弱或不發(fā)育,相對的陡坡區(qū)遷移幅度略小,鮞粒灘累計厚度略厚,且具有向上云化程度逐漸增強的特點;由于面對相對開闊的海域,3號臺緣斜坡帶風暴影響明顯,具有橫向上的云化間互及垂向云化增強特征明顯,資料有限,橫向地貌變化尚待進一步揭示;2號臺緣帶具有橫向上的鮞粒灘厚薄變化,但加積和整體云化特征穩(wěn)定。臺緣沉積結(jié)構(gòu)差異性明顯受早期長興期古地貌、海平面變化及古風向和沉積期差異沉降等因素的聯(lián)合影響。研究建立了相關(guān)臺緣帶沉積和白云巖分布模式。
[Abstract]:With the deepening of the research, it is gradually recognized that the carbonate platform marginal zone (terrace) has the difference of sedimentary structure and evolution, which not only records the paleogeographic pattern and its evolution process,At the same time, it also has an important influence on the development of related oil and gas reservoirs.Taking the early Triassic Feixianguan period of the northeastern Sichuan Basin as the object of study, the three parallel platform margin zones were comprehensively analyzed by drilling, outcrop and seismic data.It is revealed that the oolitic beach belt of the early Triassic Feixianguan platform margin in the study area obviously inherits the distribution of the reef beach belt in the Changxing period of the late Permian and has the characteristics of overall eastward migration.There are obvious differences among different platform margin zones, and two types of platform edge structures can be identified as migration type and accretive type.The migrating platform margin zone is mainly distributed in the Yuanba Longgang Liangping platform margin belt (referred to as the No. 1 platform margin belt), and the Jianchi Jiwangdong Shatuo platform margin belt (referred to as the No. 3 platform margin belt), which has the slope of platform edge slope is slow and the migration is obvious.As a result, the oolitic shoal of the platform margin belt has the characteristics of wide distribution, thin thickness and mutual cloud formation, and the accretive platform margin belt is mainly distributed in the Tiechang River Puguang Luojiazhai platform margin belt (2 platform margin zone), and the sedimentary structure is characterized by accretion in general.However, the late stage has the characteristics of eastward migration, narrow margin of platform, widespread collapse in front of platform, concentrated distribution of oolitic beach, large thickness, and complete cloud formation.The deposits and reservoir distribution in different platform margin zones are different. There is a steep and slow interphase between slope zone and platform margin zone, oolitic beach migration is obvious, the accumulation thickness of oolitic beach is thin, and cloud formation is weak or undeveloped.The migration range of the relative steep slope area is slightly smaller, the accumulative thickness of oolitic beach is slightly thicker, and it has the characteristic of gradually increasing the degree of clouding up, because of the relatively open sea area, the storm in the slope zone of the third margin has obvious influence.It has obvious characteristics of horizontal cloud interaction and vertical cloud enhancement, limited data, and the lateral geomorphologic changes need to be further revealed, while the thickness and thickness of oolitic shoal in the No. 2 margin zone are changed laterally, but the accretion and overall clouding characteristics are stable.The difference of sedimentary structure in the platform margin is obviously influenced by the early Changxing paleogeomorphology, sea level change, paleo-eolian direction and differential sedimentation, etc.The sedimentary and dolomite distribution model of the relevant platform margin zone is established.
【作者單位】： 油氣藏地質(zhì)與開發(fā)工程國家重點實驗室(成都理工大學(xué));成都理工大學(xué)沉積地質(zhì)研究院;中國地質(zhì)大學(xué)構(gòu)造與油氣資源教育部重點實驗室;中國地質(zhì)大學(xué)資源學(xué)院;中國石化勘探分公司;中國地質(zhì)大學(xué);中國石油西南油氣田分公司川東北氣礦;
【基金】：國家自然科學(xué)基金項目(41302089、41672103) 成都理工大學(xué)中青年骨干教師培養(yǎng)計劃項目;成都理工大學(xué)引進高層次人才科研項目聯(lián)合資助 中國地質(zhì)調(diào)查局項目(1212011220758)
【分類號】：P618.13

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