青南洼陷沙四上亚段沉积、储层与油气成藏

发布时间：2018-07-09 10:09

本文选题：青南洼陷 + 沙四上亚段　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：青南洼陷位于东营凹陷东部,勘探面积约为300km2,其中的主要勘探目的层段是沙四上亚段,沙四上亚段本身发育存在有多套不同的沉积体系,导致发育多种不同的沉积相类型,因而产生许多不同的储集体类型,使沙四上亚段中的储层特征十分复杂,进而使油气勘探条件变得复杂,影响进一步的油气勘探工作。针对上述问题,综合运用层序地层学、沉积学、储层地质学、石油地质学等理论和技术,针对具有不同机制的不同类型的储集体、不同类型储集体中的不同储层特征及其对青南洼陷勘探工作的油气成藏关系进行系统的研究。研究结果表明,针对青南洼陷沙四上亚段砂体类型识别出4种沉积相、11种沉积亚相;在靠近青坨子凸起的陡坡带,近岸水下扇以及扇三角洲发育其中,在青坨子凸起的南部分为西次洼和东次洼的洼陷带,扇三角洲和滨浅湖滩坝发育其中,在靠近广饶凸起北部的南部缓坡带,发育有三角洲沉积。明确了在沉积纵向剖面和沉积平面上的变化和分布规律。青南洼陷沙四上亚段储层主要为滨浅湖滩坝砂岩。储集空间类型以原生孔隙为主,其中夹杂发育少量的次生孔隙和裂缝;储层成岩作有三种类型,以点接触为主的压实作用,以亮晶方解石胶结为主的胶结作用和少量的溶解和交代作用。按照沉积相带划分,青南洼陷扇三角洲与三角洲发育中-高孔高渗储层,滨浅湖滩坝发育中孔中渗储层,近岸水下扇发育特低孔特低渗储层。青南洼陷具有良好的生储盖组合,主力含油储集层为滨浅湖滩坝砂及部分近岸水下扇储集层,从北向南呈现构造-岩性-构造油藏的分布规律,储层物性决定着油气产能,扇三角洲和三角洲油气产能最高,其次是滩坝砂体储层产能,近岸水下扇油气产能最低。
[Abstract]:The Qingnan sag is located in the eastern part of Dongying sag, and the exploration area is about 300km2. The main exploration target formation is the upper part of Sha 4. There are many sets of different sedimentary systems developed in the upper segment of sand 4, which leads to the development of many different sedimentary facies types. As a result, there are many different reservoir types, which make the reservoir characteristics in the upper submember of Sha 4 very complex, and further complicate the oil and gas exploration conditions, which will affect the further oil and gas exploration work. In order to solve the above problems, the theories and techniques of sequence stratigraphy, sedimentology, reservoir geology, petroleum geology and so on are comprehensively applied to different types of reservoirs with different mechanisms. The characteristics of different reservoirs in different types of reservoirs and their relation to hydrocarbon accumulation in exploration work in Qingnan sag are systematically studied. The results show that four sedimentary facies and 11 sedimentary subfacies have been identified according to the sandbody types of the upper submember of Sha 4 in the Qingnan sag and developed in the steep slope zone near the Qingtuozi uplift, the nearshore underwater fan and the fan delta. The southern part of the Qingtuozi uplift is divided into Xizi depression and Dongzi depression. Fan delta and shore-shallow lake beach and dam are developed among them, and delta deposits are found in the southern gentle slope zone near the northern part of Guangrao uplift. The variation and distribution of the sedimentary longitudinal profile and the sedimentary plane are clarified. The reservoir of the upper submember of Sha 4 in Qingnan sag is mainly shore-shallow lake beach dam sandstone. The main types of reservoir space are primary pores, in which a small amount of secondary pores and fractures are developed, and there are three types of reservoir diagenesis, which is compaction with point contact. The cementation is dominated by brilliant calcite cementation and a small amount of dissolution and metasomatism. According to sedimentary facies zone, fan delta and delta developed medium-high porosity and high permeability reservoir in Qingnan sag, middle pore and middle permeability reservoir developed in shoreside shallow lake beach dam, and ultra-low porosity and low permeability reservoir developed in near-shore underwater fan. The Qingnan sag has a good assemblage of source, reservoir and caprock, the main oil-bearing reservoir is shore-shallow lake beach bar sand and part of near-shore underwater fan reservoir. From north to south, it presents the distribution law of tectonic-lithology-structural reservoir, and the physical property of reservoir determines the oil and gas productivity. Fan delta and delta have the highest oil and gas productivity, followed by beach bar sand reservoir productivity, and the inshore underwater fan oil and gas productivity is the lowest.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】