本文選題：Bongor盆地　切入點(diǎn)：Baobab　出處：《現(xiàn)代地質(zhì)》2017年03期 　論文類型：期刊論文

【摘要】：以乍得Bongor盆地Baobab North油田P組為例,探討重力流水道砂體的沉積機(jī)理及構(gòu)型特征。結(jié)合巖心測(cè)井等資料,確定了P組的沉積背景,明確了單一水道的類型及其形態(tài)結(jié)構(gòu),探討了單一水道內(nèi)部的泥質(zhì)夾層的構(gòu)型特征及沉積機(jī)理。通過(guò)上述研究,認(rèn)為Baobab North油田P組主要發(fā)育三類單一水道沉積,Ⅰ類水道垂向上粒度呈典型正韻律,測(cè)井曲線自然伽馬和自然電位以鐘形為主;Ⅱ類水道在垂向上粒度以均質(zhì)韻律為主,測(cè)井曲線自然伽馬與自然電位多表現(xiàn)為箱形;Ⅲ類水道在垂向上粒度呈反韻律,測(cè)井曲線自然伽馬、自然電位等在水道下部幅度較低,呈齒化鐘形;單一水道內(nèi)部主要發(fā)育三類近水平分布的泥質(zhì)夾層,連續(xù)型泥質(zhì)夾層由于保存程度較好,測(cè)井曲線多呈半回返和全回返,平面上泥質(zhì)夾層順?biāo)鞣较蜉^長(zhǎng)(100~450 m),垂直水流方向較寬(70~300 m),且厚度較大(0.3~0.8 m);垂向上夾層頻率較高(0.13~0.7)、夾層密度較大(0.04~0.25)。間斷型泥質(zhì)夾層在水道中心部位被完全沖刷或只有很薄一部分被保留下來(lái),測(cè)井曲線為半回返或弱回返,平面上泥質(zhì)夾層順?biāo)鞣较蜉^短(50~250 m),垂直水流方向較窄(40~200 m),厚度較薄(0.15~0.5 m);垂向上夾層頻率較低(0.12~0.4)、夾層密度較小(0.04~0.14)。復(fù)雜型泥質(zhì)夾層是指連續(xù)型泥質(zhì)夾層和間斷型泥質(zhì)夾層在單一水道砂體中同時(shí)發(fā)育,該類泥質(zhì)夾層的規(guī)模與頻率居中,順?biāo)鞣较蜷L(zhǎng)度介于80~320 m,垂直水流方向?qū)挾冉橛?5~240 m,厚度介于0.25~0.6 m,夾層頻率介于0.12~0.45、夾層密度介于0.04~0.18。
[Abstract]:Taking P formation of Baobab North oilfield in Bongor basin of Chad as an example, the sedimentary mechanism and configuration characteristics of gravity income channel sand body are discussed. Combined with core logging data, the sedimentary background of P formation is determined, and the types and morphological structure of single channel are defined. The structural characteristics and sedimentary mechanism of the muddy intercalation in a single waterway are discussed. It is considered that three types of single channel deposits are mainly developed in P formation of Baobab North oilfield, and the vertical grain size of type I waterways is in a typical positive rhythm. The natural gamma-ray and natural potential of logging curves are mainly bell shaped, the homogenous prosody is dominant in the vertical grain size of type 鈪，

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