潜江凹陷马王庙地区新沟嘴组下段成岩作用

Diagenesis in the Lower Member of Xingouzui Formation in Mawangmiao Area of Qianjiang Depression

谢春安 贾秀容 胡明毅 胡忠贵

XIE Chunan JIA Xiurong HU Mingy HU Zhonggui

中国石汕化工股份有限公司河南油田分公司勘探开发研究院, 河南南阳 473132; 油气资源与勘探技术教育部重点实验室, 湖北荆州 434023

Research Institute of Petroleum Exploration and Development of SINOPEC Henan Oilfield Company, Nanyang Henan 473001, China; Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Jingzhou Hubei 434023, China

从沉积环境背景出发, 通过岩心观察、薄片鉴定和扫描电镜分析等方法对江汉盆地潜江凹陷马王庙地区古近系新沟嘴组下段储层成岩作用做了系统的研究。研究表明马王庙地区新下段沉积时期盆地处于干旱蒸发—氧化环境的Ⅰ型沉积环境和半干旱—潮湿弱氧化—弱还原环境的Ⅱ型沉积环境, 相应地发育两种储层, 经历了两种成岩类型, 受其相应的地层水影响, 成岩作用差异较大。Ⅰ型成岩作用以胶结作用更显著, 对储层孔隙起破坏作用, 其较好储层发育受断裂带控制;Ⅱ型成岩作用以溶解作用为主, 对储层具有建设作用, 成藏面积广, 其储层物性相对较好。该认识为深入研究该区成岩作用规律奠定了基础, 也有助于油区进一步勘探开发。

Based on depositional environment analysis, study on diagenesis has been conducted systematically for the lower member of Xingouzui Formation of Paleogene in Mawangmiao area of Qianjiang Sag in Jianghan basin. The study results indicate that the lower member of Xingouzui Fm in Mawangmiao area was in arid and evaporated-oxidative model I sedimentary environment and half arid-humid climate, weak oxidative-weak reductive model II sedimentary environment. Accordingly, two types of reservoirs have been developed, two types of diagenesis have occurred, with quite different influence on reservoir quality due to the influence of formation water. Cementation is dominated in Model I diagenesis, with great damage to reservoir pores, and the better quality reservoirs were developed in fault zones. Model II diagenesis is dominated by chemical denudation, with positive effect on reservoir quality, and the reservoir properties are relatively good, being favorable for HC accumulation widely. This understanding provides a solid foundation for study of the diagenesis in this area, and also contribute to further exploration and development of this oil bearing area.

中石化委托科研项目"潜南地区新沟咀组下段沉积相及砂体展布规律研究"(G0601-09-ZS-0034)

https://doi.org/10.3969/j.issn.1008-2336.2013.04.024