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Pliocene hyperpycnal flow and its sedimentary pattern in D block of Rakhine Basin in Bay of Bengal
Petroleum Exploration and Development ( IF 7.5 ) Pub Date : 2020-04-17 , DOI: 10.1016/s1876-3804(20)60049-0
Lihong ZHOU , Zhihua SUN , Ge TANG , Dunqing XIAO , Zheng CAI , Haiqiang WANG , Junqing SU , Shuangjun HUA , Wei GE , Changwei CHEN

Based on core, logging, lab test and seismic data, sedimentary characteristics and pattern of marine hyperpycnal flow, the distribution rules of hyperpycnal flow reservoir, prediction method of favorable hyperpycnal flow reservoir zones, hydrocarbon accumulation model in hyperpycnal flow reservoir in D block of Bay of Bengal were investigated, and the favorable exploration zone and well sites were predicted. Pliocene in D block has typical hyperpycnal flow sediment, which is a set of fine-medium sandstone held between thick layers of marine mudstone and features a series of reverse grading unit and normal grading unit pairs. The hyperpycnal flow sediment appears as heavily jagged box shape, bell shape and tongue shape facies on log curves with linear gradient, and corresponds to multiple phases of deep channels on the seismic section and high sinuous channel on stratal slices. The sedimentary bodies formed by a single phase hyperpycnal flow which include five types of microfacies, namely, supply channel (valley), channel complex, branch channel, levee and sheet sand. The hyperpycnal flow sediments appear in multiple branches, multiple generations and stages in space, forming high-quality reservoirs in strips on the plane and superposition vertically, with fairly good physical properties. The channel complex sandstone, with large thickness, coarse particle size and good physical properties, is the most favorable exploration facies. Based on the guidance of the sedimentary model, distribution of the channel complex microfacies was delineated in detail by seismic reflection structure analysis, spectrum waveform characteristic analysis, slice and attribute fusion, and combined with the structural feature analysis, the favorable drilling zone was sorted out, effectively guiding the exploration deployment of the block.



中文翻译:

孟加拉湾若开河流域D区块上新世高压流及其沉积模式

基于岩心,测井,实验室测试和地震数据,海洋高变流的沉积特征和规律,高变流储层的分布规律,有利的高变流储层预测方法,海湾D区块高变流储层油气成藏模型对孟加拉国进行了调查,并预测了有利的勘探区和井位。D块上新世具有典型的高变质流沉积物,是一组固在海洋泥岩厚层之间的中型砂岩,具有一系列反向定级单元和正常定级单元对。高温流沉积物在线性梯度的对数曲线上表现为锯齿状,钟形和舌形的重锯齿状相,对应于地震剖面上深通道和地层切片上高弯曲通道的多个阶段。由单相高热流形成的沉积体包括五种类型的微相,即供应河道(谷),河道复合体,支流河道,堤防和片状砂。高温流沉积物出现在空间的多个分支,多个世代和阶段,在平面上呈条状并垂直叠置形成高质量的储层,具有相当好的物理性质。河道复合砂岩厚度大,粒径大,物性好,是最有利的勘探相。在沉积模型的指导下,通过地震反射结构分析详细描述了河道复杂微相的分布,

更新日期:2020-04-17
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