渤海湾盆地束鹿凹陷古近系沙河街组湖相混积泥灰岩致密油储层特征

doi:10.11743/ogg20190108

摘要/Abstract

摘要：

渤海湾盆地束鹿凹陷沙河街组三段下亚段（Es^3（下））广泛发育一套湖相混积成因“泥灰岩”，是致密油勘探的主要目标层系。通过岩心和薄片观察、孔渗、压汞、扫描电镜、CT、核磁共振等分析，揭示了该套特殊成因混积泥灰岩储层地质特征；结合地质、地球化学综合分析，明确有利储层发育主控因素，建立储层分类评价标准，指出致密油勘探有利区带。结果表明：束鹿凹陷Es^3（下）泥灰岩主要包括互层混积的纹层状泥灰岩和结构混积的块状泥灰岩两类，矿物组成均以方解石为主，其次为白云石，粘土矿物与石英、长石含量低。储层孔隙度一般低于4.0%，基质渗透率一般小于10×10^-3 μm²，属特低孔特低渗储层。储层孔隙类型多样、孔隙结构复杂，发育两大类8亚类储集空间，基质孔以纳米级孔隙为主。不同岩石结构的泥灰岩储层物性与孔隙结构差异明显，纹层状泥灰岩孔隙分布非均质性强，表现出双重或多重孔隙介质特征，孔渗条件和孔隙结构优于块状泥灰岩。混积泥灰岩有利储层发育受沉积亚相、岩石组构、有机质丰度与成熟度、构造缝等因素综合控制；斜坡内带及洼槽区半深湖-深湖亚相的高TOC纹层状泥灰岩是致密油勘探的有利目标。

关键词: 混积泥灰岩, 致密油储层, 沙河街组, 束鹿凹陷, 渤海湾盆地

Abstract:

Lacustrine marlstones of mixed silisiclastic-carbonate origin are widely developed in the lower third member of the Shahejie Formation(Es^3L)in the Shulu Sag,Bohai Bay Basin,and are the main target layers for tight oil exploration.Various data including core analysis,thin section observation,porosity and permeability measurement,mercury intrusion porosimetry,scanning electronic microscope(SEM),CT scanning and nuclear magnetic resonance(NMR) were used to clarify the geologic properties of the special marlstone reservoir of mixed silisiclastic-carbonate origin.Based on the comprehensive analyses in geology and geochemistry,the main controlling factors favorable for reservoirs development were revealed,the criteria for reservoir classification and evaluation were established,and furthermore the favorable plays for tight oil exploration were pointed out.The results indicate that the marlstones in Es^3L can be divided into two groups,namely lamellar marlstones of interlaminated mixing and blocky marlstones of structural mixing.The mineral compositions of both types are dominated by calcite,followed by dolomite,and are low in contents of clay,quartz,and feldspar.The re-servoir porosity is typically below 4.0%,and matrix permeability less than 10×10^-3 μm²,manifesting its nature of ultra-low porosity and extra-low permeability reservoir.There are diverse types of reservoir pores with complicated structures,which can be divided into two categories and eight subcategories.Most of the matrix pores are nanopores.Reservoir pro-perties and pore structures are distinctly different between marlstones with diverse structures:the pore distribution in the lamellar marlstones is highly heterogeneous,featuring double or multi-porosity media;the lamellar marlstones are better than blocky marlstones in terms of porosity and pore structure.The favorable marlstone reservoirs of mixed silisiclastic-carbonate origin are controlled by sedimentary subfacies,rock fabric,abundance and maturity of organic matters,and density of structural fractures.As for tight oil exploration,the lamellar marlstones with high TOC that are deposited in inner slope and semi-deep and deep lacustrine subfacies of trough areas are the favorable targets for tight oil exploration.

Key words: mixed marlstone, tight oil reservoir, Shahejie Formation, Shulu Sag, Bohai Bay Basin

中图分类号:

TE122.2

付小东,吴健平,寿建峰,等. 渤海湾盆地束鹿凹陷古近系沙河街组湖相混积泥灰岩致密油储层特征[J]. 石油与天然气地质, 2019, 40(1): 78-91. doi: 10.11743/ogg20190108 Fu Xiaodong,Wu Jianping,Shou Jianfeng,et al. Tight oil reservoir characteristics of lacustrine mixed marlstone in the Palaeogene Shahejie Formation of Shulu Sag,Bohai Bay Basin[J]. Oil & Gas Geology, 2019, 40(1): 78-91. doi: 10.11743/ogg20190108

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