Distribution of diagenetic facies and prediction of high-quality reservoirs in the Lower C retaceous of the Tanzhuang Sag，the southern North China Basin

doi:10.11743/ogg20100411

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Distribution of diagenetic facies and prediction of high-quality reservoirs in the Lower C retaceous of the Tanzhuang Sag，the southern North China Basin
Vol. 31, Issue 4, Pages: 472-480(2010)
Online First：28 August 2010，

Published：2010
DOI： 10.11743/ogg20100411
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DOI：

Distribution of diagenetic facies and prediction of high-quality reservoirs in the Lower C retaceous of the Tanzhuang Sag，the southern North China Basin[J]. 2010, 31(4): 472-480. DOI： 10.11743/ogg20100411.

摘要

利用普通薄片、铸体薄片、扫描电镜及物性等分析化验资料，对影响南华北盆地谭庄凹陷下白垩统储层物性的压实作用、胶结作用和溶蚀作用等成岩作用强度进行了定量计算，得出了不同井和不同层段的视压实率、视胶结率和视溶蚀孔隙度，厘定了成岩强度划分标准。将下白垩统储层划分为5种成岩相类型，其中Ⅰ和Ⅱ类成岩相为较好的储集相带，Ⅲ类为中等储集相带，Ⅳ和Ⅴ类为差的储集相带。通过成岩相分布预测，结合沉积体系及次生孔隙发育分布规律，认为谭庄凹陷南部扇三角洲的北部区域、北部三角洲的南部区域处于中等-较强压实强胶结中等溶蚀成岩相带，为各层段的有利储集相带。

Abstract

Using data such as ordinary thin sections，casting thin sections，scanning electronm icroscope observaˉtions and testing，we quantitatively calculate the diagenesis intensity parameters such as compaction，cementation and dissolution，which influence physical properties of the Lower Cretaceous reservoirs in the Tanzhuang sag，southern North China Basin.The apparent rates of compaction，cementation and dissolution porosity in different wells and intervals are obtained and the division standards of diagenesis intensity are determ ined.The Lower Cretaceous reservoirs are divided into five types of diagenetic facies.The typeˉⅠand typeˉⅡare good reservoir facies belts，the typeⅢis fair reservoir facies belt，while the typeⅣand typeˉⅤare poor reservoir facies belts.By predicting distribution ofdiagenetic facies and in combinationwith study ofdepositional systems and distribuˉtion pattern of secondary pores，we believe that the northern part of the southern fan delta and the southern part of the northern delta in the Tanzhuang sag，with moderate toˉrelatively high compaction，high cementation and moderate dissolution，are favorable reservoir facies belts for each interval.