Diagenesis in sequence stratigraphical framework: a case study of sandstone of Member 3 of Shahejie Formation in the south-central Raoyang sag

doi:10.7623/syxb201606004

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (6): 728-742.DOI: 10.7623/syxb201606004

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Diagenesis in sequence stratigraphical framework: a case study of sandstone of Member 3 of Shahejie Formation in the south-central Raoyang sag

Zhang Kaixun¹, Bai Guoping^1,2, Jin Fengming³, Wang Quan³

1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
3. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China

Received:2015-12-24 Revised:2016-03-06 Online:2016-06-25 Published:2016-06-30

层序地层格架内成岩作用——以饶阳凹陷中南部沙河街组三段砂岩为例

张凯逊¹, 白国平^1,2, 金凤鸣³, 王权³

1. 中国石油大学地球科学学院北京 102249;
2. 中国石油大学油气资源与探测国家重点实验室北京 102249;
3. 中国石油华北油田公司河北任丘 062552

通讯作者: 白国平,男,1963年5月生,1984年获华东石油学院学士学位,1992年获澳大利亚悉尼大学博士学位,现为中国石油大学(北京)教授,主要从事全球油气分布、国外含油气盆地分析和储层地质学等方面的研究工作。Email:baigp@cup.edu.cn
作者简介:张凯逊,男,1985年8月生,2008年获中国石油大学(北京)学士学位,现为中国石油大学(北京)博士研究生,主要从事石油地质综合研究。Email:zhangkaixun@126.com
基金资助:
国家油气重大科技专项(2011ZX05006-005)和国土资源部油气中心科技项目(2015YQKYQ0401)资助。

Abstract

Abstract:

By making full use of thin-section analysis, well logging and drilling data as well as previous research results of sequence stratigraphy, the diagenetic characteristics of sandstones of Member 3 of Shahejie Formation in the south-central Raoyang sag were discussed from two aspects, i.e., the control of sequence interface on diagenetic characteristics and the development laws of diagenesis in different system tracts. The research results indicate that sequence interface is able to control the sandstone dissolution and carbonate cementation beneath the interface, but unable to facilitate the sandstone dissolution above the interface as a preferential pathway for fluid migration. Sandstones in the low-stand system tract tend to be mixed with clays with poor compaction resistance, where primary pores are not prone to be preserved, and early carbonate cements are likely to deposit from the over-saturated alkaline water mass. Sandstones in the transgressive system tract have fine grain sizes but with better sorting. As a result, primary pores could be preserved at the early diagenetic stage, and directly contacted with source rocks, prone to be dissolved by organic acids to form secondary pores. Sandstones in the high-stand system tract consist of well-sorted coarse grains with high compaction resistance of sediments and shallower buried depth, where primary pores are prone to be preserved. In addition, influenced by the overlying sequence interface, secondary pores are formed in sandstones through the leaching of atmospheric waters at the early diagenetic stage, which are further dissolved by the subsequent charging of organic acids, so that the reservoirs have best quality. In this study, the diagenetic paragenetic sequence and evolution models are proposed for sandstones in different system tracts during syndiagenetic, eogenetic and mesogenetic stages, so as to characterize the diagenetic characteristics in a sequence stratigraphic framework and achieve the correlation tracing of high-quality reservoirs.

Key words: sequence stratigraphy, diagenesis, sequence interface, system tract, diagenetic evolution, reservoir quality

摘要：

充分利用薄片分析和钻、测井资料以及前人层序地层学研究成果,从层序界面对成岩特征的控制以及不同体系域内的成岩作用发育规律2个方面探讨饶阳凹陷中南部沙河街组三段层序地层格架内的砂岩成岩作用特征。研究结果表明:层序界面控制了界面之下砂岩的溶蚀和碳酸盐胶结作用,但并没有作为流体运移的优势通道促进界面之上砂岩的溶蚀作用;低位体系域砂岩砂泥混杂,抗压实能力差,原生孔隙不易保存,且早期碳酸盐胶结物易从过饱和的碱性水体中沉淀;湖侵体系域砂岩粒度细,但分选较好,在早成岩阶段原生孔隙可得到一定保存,且与烃源岩直接接触,易于接受有机酸溶蚀形成次生孔隙;高位体系域砂岩颗粒较粗、分选好,沉积物抗压实能力强,埋藏相对较浅,原生孔隙容易保存,且受上覆的层序界面影响,在成岩早期接受大气淡水淋滤形成次生孔隙,加之后期有机酸的充注可进一步促进其溶蚀,因而储层质量最好。研究中提出了不同体系域砂岩经历的同生成岩、早成岩和中成岩阶段的成岩共生序列和成岩演化模式,表征了层序地层格架内的成岩作用特征,可实现优质储层的对比追踪。

关键词: 层序地层学, 成岩作用, 层序界面, 体系域, 成岩演化, 储层质量

CLC Number:

TE122.14

Zhang Kaixun, Bai Guoping, Jin Fengming, Wang Quan. Diagenesis in sequence stratigraphical framework: a case study of sandstone of Member 3 of Shahejie Formation in the south-central Raoyang sag[J]. Acta Petrolei Sinica, 2016, 37(6): 728-742.

张凯逊, 白国平, 金凤鸣, 王权. 层序地层格架内成岩作用——以饶阳凹陷中南部沙河街组三段砂岩为例[J]. 石油学报, 2016, 37(6): 728-742.

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Diagenesis in sequence stratigraphical framework: a case study of sandstone of Member 3 of Shahejie Formation in the south-central Raoyang sag

层序地层格架内成岩作用——以饶阳凹陷中南部沙河街组三段砂岩为例

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