咸化湖盆成岩致密带形成机制及其地质意义

发布时间：2018-03-18 04:06

本文选题：成岩致密带　切入点：形成机制　出处：《西南石油大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：针对成化湖盆成岩早期储层致密的问题,开展了这一成岩致密带的形成机制及其地质意义的研究。研究中以渤南洼陷沙四上亚段为例,综合物性分析、铸体薄片、全岩矿物X衍射等分析化验资料,认识到渤南洼陷沙四上亚段的成岩致密带上碳酸盐岩胶结物发育,胶结率普遍大于0.5,压实率低于0.2;早期较强胶结作用使原生孔隙所剩无几,造成后期有机酸与可溶矿物的接触面积变小,大量溶蚀发生的时间滞后,从而在2 800~3 200 m形成致密带;致密带上储层孔隙度普遍小于12%,有利储集体应为致密带上、下的扇三角洲前缘、混积岩滩坝及近岸水下扇扇端;致密带物性较差,不但可阻止油气二次运移,使其上、下油气聚集方式存在差异,而且致密带内、外油气富集程度和产能也存在差异。
[Abstract]:The formation mechanism and geological significance of the diagenetic tight zone were studied in allusion to the problem of tight reservoir in the early diagenetic stage of Chenghua Lake basin. Taking the upper submember of Sha 4 in Bonan sag as an example, comprehensive physical properties analysis, casting thin slice, etc. The X-ray diffraction analysis of whole rock minerals shows that the carbonate cementation in the diagenetic and dense zone of the upper submember of Sha 4 in Bonan sag has developed, the cementation rate is generally greater than 0.5 and the compaction rate is lower than 0.2. As a result, the contact area between organic acid and soluble minerals becomes smaller in the late stage, and the time of mass dissolution is delayed, thus forming a tight zone at 2 800 ~ 3 200 m, and the porosity of the reservoir in the tight zone is generally less than 12, so the favorable reservoir body should be the dense zone. The lower fan delta front, mixed rock beach dam and nearshore underwater fan end have poor physical properties, which can not only prevent the secondary migration of oil and gas, but also lead to the difference of oil and gas accumulation modes in the upper and lower zones. There are also differences in oil and gas enrichment and productivity.
【作者单位】：西南石油大学地球科学与技术学院;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05006-001)
【分类号】：P618.13

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