大安J南区块泉四段沉积相研究

发布时间：2018-04-30 12:02

本文选题：大安油田J南区块 + 泉四段　；参考：《山东科技大学》2017年硕士论文

【摘要】：大安油田位于松辽盆地的中央坳陷区大安—红岗阶地,J南区块位于大安油田的西南部,靠近背斜构造轴部,属于构造—岩性油藏。区块内发育两条主断层和一条次生小断层,断层走向为北北西向,由于小断层切割影响,导致小断层与西边主断层条带区域井网不规则。前人的研究主要是针对整个大安油田,很少对J南区块进行精细的研究,但是因为受到构造、岩性等的影响,各区块间的沉积微相有很大差异,而且因为沉积体系的特殊性,前人对此争议不断。因此对本区地层进行精细划分、沉积微相进行精细研究都是极为重要的,能够对油气勘探与开发进行有效的指导。本论文以测井数据为主体资料,测井曲线常规识别为基础,综合运用最大熵谱分析,将大安J南区块泉四段分为4个中期旋回和1个长期旋回,建立了大安油田J南区块层序地层划分方案。研究区泉四段划分为4个油组14个地质小层,最终建立了研究区泉四段的高分辨率层序地层格架。通过绘制大安油田与J南区块的泥岩颜色指数平面图、ZTR指数平面图、砂厚与砂地比平面图,并结合松辽南部盆地的单井相分析、岩心照片和区域沉积背景综合分析认为研究区泉四段物源来自西部白城水系和西南部保康水系。泥岩颜色主要为棕红色或紫红色,部分地区为灰绿色、灰色。后者主要分布在泉四段上部,反映出一个水进的沉积过程,表明泉四段的上部沉积物主要处于氧化环境。砂岩类型主要为长石岩屑砂岩,其中长石及岩屑成分含量较高,稳定成分含量较少;碎屑颗粒磨圆度较差,分选性好,呈点状接触,基质含量高,结构成熟度低,说明离物源较近或者受改造作用较小。分析认为研究区泉四段发育末端扇沉积体系,其最大的特征为:砂体中富含泥质条带,河道的冲刷面之上常直接发育平行层理。通过对各小层砂体和微相的分析,绘制了大安油田J南区块泉四段各小层砂体厚度平面图、沉积微相平面图以及沉积微相剖面图,最终建立了研究区末端扇沉积体系的沉积模式,明确了砂体的分布特征和时空演化规律。
[Abstract]:The Da'an oilfield is located in the central depression of Songliao Basin, the Da'an-Honggang terrace is located in the southwestern part of the Da'an oilfield, near the anticline structural axis, and belongs to the tectonic-lithologic reservoir. There are two main faults and one minor secondary fault in the block. The strike of the fault is NNW. Due to the influence of the small fault cutting, the well pattern of the small fault and the west main fault strip is irregular. Previous studies have mainly focused on the entire Da'an Oilfield, and few detailed studies have been carried out on the South J block. However, due to the influence of structure and lithology, the sedimentary microfacies of each block are very different, and because of the particularity of the sedimentary system, There was a lot of controversy about it from previous generations. Therefore, it is very important to divide the strata and study the sedimentary microfacies in this area, which can guide the exploration and development of oil and gas effectively. On the basis of logging data and conventional recognition of logging curves, this paper synthetically uses maximum entropy spectrum analysis to divide the fourth member of Quan in the south block of Da'an J into four intermediate cycles and one long-term cycle. The sequence stratigraphic division scheme of South J block in Da'an Oilfield is established. The fourth member of Quan formation in the study area is divided into 4 oil formations and 14 geological layers. Finally, the high-resolution sequence stratigraphic framework of the fourth member of the study area is established. By drawing the mudstone color index plan and the sand thickness and sand soil ratio plan of Da'an Oilfield and Southern J Block, and combining with the analysis of single well facies in the southern Songliao Basin, The comprehensive analysis of core photographs and regional sedimentary background shows that the source of the fourth member of Quan in the study area comes from the Baicheng water system in the west and the Baokang water system in the southwest. Mudstone color is mainly brownish red or purplish red, some areas are grayish green, gray. The latter mainly distributes in the upper part of the fourth member of the spring, which reflects the deposition process of a water advance, indicating that the upper sediment of the fourth member of the spring is mainly in the oxidation environment. The sandstone type is mainly feldspathic lithic sandstone, in which feldspar and lithic components are high, and stable components are less, and clastic grains are of poor roundness, good sorting, point contact, high matrix content and low structural maturity. It shows that the material source is near or the effect of modification is less. It is considered that the terminal fan sedimentary system developed in the fourth member of the Quan formation in the study area is characterized by the following characteristics: the sand body is rich in muddy bands and the parallel bedding is often developed directly above the erosion surface of the river course. Based on the analysis of the sand bodies and microfacies of each small layer, the thickness plans, sedimentary microfacies and sedimentary microfacies profiles of each small sand body in the fourth member of Quan formation in the South J block of Da'an Oilfield are drawn. Finally, the sedimentary model of the end-fan sedimentary system in the study area is established, and the distribution characteristics and space-time evolution law of the sand body are clarified.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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