碳酸盐岩早期差异成储路径及其对储集性能的影响:以滨里海盆地N油田石炭系KT-Ⅰ与KT-Ⅱ层系为例<sup>*</sup>

doi:10.7605/gdlxb.2023.01.015

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Abstract

Taking Carboniferous KT-I and KT-II carbonate reservoirs in N oilfield in Pre-Caspian Basin as an example,the characteristics of carbonate reservoirs and evolution of reservoir properties at the early stage are systematically studied based on the core analysis,thin section,scanning electron microscopy,high-pressure mercury invasion,conventional physical property analysis and various tests. In addition,the relationship among the evolution of reservoir properties,pore throat structure and quality is further discussed. The results show that KT-I reservoir is dominated by dolomite with intergranular dissolved pores and small karst caves with good pore-throat connectivity,which belongs to high porosity-high permeability pore-cavity reservoir,followed by grainstone with intragranular dissolved pores,mold pores and biologic cavity pores that have the poor pore-throat connectivity,which belongs to the pore-type reservoir with the medium porosity and low permeability. KT-II reservoir is characterized as grainstone with intergranular dissolved pores and biologic cavities,belonging to the porous reservoir with medium-high porosity and high permeability. Further analysis shows that the thickness of single cycle layer of KT-I dolomite and limestone reservoirs is small,which is controlled by the early diagenetic karst driven by high frequency sea-level fluctuation. The thickness of KT-II layer is large,and there is no early karstification of the grain beach. There are mainly three types of reservoirs: (1)Penecontemporaneous dolomitization with stable transformation of minerals results in the dissolution of some minerals,followed by the formation of reservoirs controlled by the karstification at early diagenetic stage,and the pressure dissolution-resistance rock skeleton helps the protection of reservoir;(2)The early diagenesis karstification promoted the reservoir property→the early compaction controls the chemical fluid migration that can induce the cementation→differential cementation controls the preservation of intergranular pore and intragranular pore;(3)Primary sedimentary environment controls the formation of reservoir→early compaction and cementation control preservation of reservoir. Different reservoir formation mechanisms lead to different porosity,permeability and pore throat structure,which controls the quality of reservoirs including the dolomite and grainstone after early karstification,and the limestone that owns the primary pores. The results will provide a reference for the genetic analysis of carbonate reservoirs with similar characteristics. It also has significant karst geology meaning based on the discovery that dolomite is much easier to dissolve than limestone during the early diagenetic stage.

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	Articles by authors
	LU Jiaxi
	TAN Xiucheng
	JIN Zhimin
	CHEN Yefei
	WANG Shuqin
	ZHAO Wenqi
	LI Changhai

Key words： carbonate rock reservoir performance reservoir formation pathway eogenetic karstification Carboniferous Pre-Caspian Basin

Received: 18 July 2022

ZTFLH:

TE122.2

Fund:

Financially supported by the Fourteenth Five-Year Plan Forward-looking Basic Science and Technology Project of CNPC(No.2022DJ3209)

Corresponding Authors: TAN Xiucheng,born in 1970,is a professor in Southwest Petroleum University. He is engaged in sedimentology and reservoir geology. E-mail: tanxiucheng70@163.com.

About author: LU Jiaxi,born in 1998,is a master's degree candidate in Southwest Petroleum University. He is mainly focus on reservoir geology research. E-mail: lujiaxi199801@163.com.

Cite this article:

LU Jiaxi,TAN Xiucheng,JIN Zhimin et al. Differential reservoir formation paths of carbonate rocks in early stage and impacts on reservoir properties: a case study of KT-Ⅰ and KT-Ⅱ layers in N Oilfield,Pre-Caspian Basin[J]. JOPC, 2023, 25(1): 226-244.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.01.015 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I1/226

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