收稿日期: 2022-11-12
修回日期: 2022-12-11
网络出版日期: 2023-03-23
基金资助
国家自然科学基金项目(42102135);重庆市教育委员会科学技术研究项目(KJQN202101535)
Component characteristics of Shanxi Formation tight sandstone and their implications for the reservoirs in Ordos Basin: Taking the A block of Daniudi Gas Field as an example
Received date: 2022-11-12
Revised date: 2022-12-11
Online published: 2023-03-23
Supported by
The National Natural Science Foundation of China(42102135);the Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN202101535)
鄂尔多斯盆地二叠系山西组具有较为丰富的致密气勘探潜力。目前,对于山西组致密砂岩储层精细成分特征及其对储层物性、成岩作用的影响还未开展深入研究,制约了山西组优质储层的评价及空间分布预测。以大牛地气田A区山西组为例,基于详细的镜下观察和统计分析,结合孔渗和压汞资料,查明致密砂岩主要成分类型及特征,明确成分含量与储层类型和成岩作用增/减孔率的关系,进而探讨优质储层形成机理。研究区山西组致密砂岩储层以岩屑石英砂岩和岩屑砂岩为主,主要成分可分为4个大类16个小类,其中石英、岩屑和凝灰质杂基是主体,并可将主要成分归为刚性、半塑性、塑性3类。致密砂岩成分含量及物理性质对储层的控制作用主要表现在抗压实能力、溶蚀流体流通性、可溶成分含量3个方面。粒径粗(粗砂级及以上),较高的石英含量(70%~90%)、较高的刚性颗粒含量(60%~80%)、低含量的半塑性+塑性成分(20%~30%)有利于抗压实,降低砂岩的致密程度,并为溶蚀流体的流通提供有利条件,但也加剧了胶结作用;一定量的岩屑(20%~30%)和凝灰质杂基(10%~20%)可以为溶蚀提供母质;而一定量的凝灰质也有利于阻止胶结作用。综合来看,A区北部和中部的储层优于南部,W14井区储层最为有利,W12井区和W10井区次之,其他井区储层相对较差。
雷涛, 王桥, 任广磊, 朱朝彬, 王濡岳, 王佳, 兰超, 谭先锋, 瞿雪姣 . 鄂尔多斯盆地山西组致密砂岩成分特征及其对储层的制约——以大牛地气田A区为例[J]. 天然气地球科学, 2023 , 34(3) : 418 -430 . DOI: 10.11764/j.issn.1672-1926.2022.12.012
The exploration potential is huge for tight sandstone gas reservoir of the Permian Shanxi Formation in Ordos Basin. However, the high quality reservoir evaluation and its spatial distribution and prediction in Shanxi Formation has been hampered by a poor understanding of the fine description of tight sandstone components and their implications for the reservoirs and diagenesis. Taking the Shanxi Formation in A block of Daniudi Gas Field as an example, with a combination of porosity and permeability data, mercury injection data and thin section observation, the main types of tight sandstone components, the relationship between tight sandstone components content and reservoir types, and pore increase or reduction ratio caused by main diagenesises were studied. Furthermore, the formation mechanisms of high quality reservoir were also discussed. The research shows that the reservoir rocks of Shanxi Formation in Daniudi Gas Field are quartz sandstone and lithic sandstone; the components of sandstone can be divided into four categories and 16 types. Quartz, lithic debris and tuffaceous matrix are the main components. Those components of sandstone can be divided into three parts such as rigid particles, semi-plastic particles and plastic components. The reservoir quality of tight sandstone was controlled by compaction resistance of components, flow capacity of dissolution fluid, the content of soluble components. High content coarse-grained particles, high content quartz (70%-90%) and rigid particles (60%-80%), low content semi-plastic particles and plastic components (20%-30%) are favorable to strengthen the compression resistance, lower the degree of compaction to the densifying and accelerate the flow of dissolution fluid, but the cementation may increase in this system. Relatively high content of lithic debris (20%-30%) and tuffaceous matrix (10%-20%) are favorable for dissolution. At the same time, relative high content of tuffaceous matrix is unfavorable for cementation. To sum up, the reservoir quality of Shanxi Formation in the northern and middle parts of Daniudi Gas Field is better than that in the south, the reservoir conditions of W14 wellblock is the best, followed by the W12 and W10 wellblocks, and the other part in study area is the worst.
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