Analysis of depositional facies and palaeoenvironment of the lower miocene reservoir in the northern area, block 05-1(a), DH oil field, Nam Con Son basin

Huynh Tan Tuan
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Abstract

Sediment depositional environments are one of the important scientific basesin evaluation the reservoir potential of sedimentary rocks. This thesis focuses on studying the facies and environment of the terrigenous sediments of the Lower Miocene in the northern area of block 05-1(a), mine DH, Nam Con Son basin. The thesis has integrated the method of interpreting the geophysical data of the wells combined with the lithological analysis documents, the results of paleontological analysis to clarify some contexts of lower Miocene sedimentation of the study area. rescue. In which, it can be seen that at 3 wells DH-A, DH-B, DH-C, there are similarities in sedimentary environment as follows: From H170-H150, the sedimentary environment changes from the delta to the upstream delta and to the downstream delta. With an abundant supply of sedimentary material and mainly coarse-grained sand to siltstone, it is transported and deposited quickly in a high-energy environment and at a distance not too far from the source. From H150-H80 the sedimentary environment alternates in the cycle. Mainly alternating between the lower delta and Delta front along with the sedimentary origin formed mainly in the low-energy environment, petrography consists of debris sediments (sandstone, shale and coal). The sandstone is very fine to fine grained, moderately to fine graded, round in shape from periphery to rounded. They can therefore be transported long distances from the source. The sedimentary environment of the three wells has a strong connection with each other, possibly due to rapid subsidence and accretion with a huge amount of material forming sediments in the above environments and has a wide distribution through the data mentioned above. Sediments belonging to such environments are very favorable as well as valuable in terms of generating, storing and blocking oil and gas. Bay-pool lightning has high oil-producing potential. Pre-delta or estuarine sandstone has good storage capacity. Consolidated clay seams can also be retaining layers. Therefore, through the results of the study of the sedimentary environment, the lower Miocene layer of block 05-1(a) through the wells DH-A, DH-B, DH-C is very promising for petroleum.
南孔山盆地DH油田05-1(a)区块北部地区下中新世储层沉积面及古环境分析
沉积沉积环境是评估沉积岩储层潜力的重要科学依据之一。本论文主要研究南冠山盆地 DH 矿 05-1(a)区块北部地区下中新世陆相沉积的岩相和环境。论文综合了解释井地球物理数据的方法,结合岩性分析文件和古生物分析结果,阐明了研究区下中新世沉积的一些脉络。其中可以看出,DH-A、DH-B、DH-C 3 口井的沉积环境有如下相似之处:从 H170-H150 开始,沉积环境由三角洲向上游三角洲和下游三角洲变化。在高能环境下,沉积物供应充足,主要为粗粒砂岩至粉砂岩,在离源头不远的地方被快速搬运和沉积。从 H150-H80 开始,沉积环境在循环中交替变化。主要在下三角洲和三角洲前沿之间交替,沉积起源主要在低能量环境中形成,岩相包括碎屑沉积物(砂岩、页岩和煤)。砂岩的粒度为极细至细粒、中等至细级配,形状从外围到圆形均为圆形。因此,它们可以从源头远距离迁移。三口井的沉积环境相互之间有很强的联系,可能是由于快速沉降和增生,大量物质在上述环境中形成沉积物,并通过上述数据广泛分布。属于这种环境的沉积物对油气的生成、储存和封存非常有利,也非常有价值。湾池闪电具有很高的产油潜力。前三角洲或河口砂岩具有良好的储存能力。固结粘土层也可以成为储油层。因此,通过对沉积环境的研究结果,DH-A、DH-B、DH-C 井所在的 05-1(a)区块下中新世层具有很好的石油开采前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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