渤海湾盆地临南洼陷古近系沙河街组源-储组合类型与致密(低渗)砂岩油差异富集模式
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Source rock-reservoir assemblage types and differential oil enrichment model in tight (low-permeability) sandstone reservoirs in the Paleocene Shahejie Formation in the Linnan Sub-sag, Bohai Bay Basin
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通讯作者: 刘华(1977—),女,博士、教授,油气藏形成机理与分布规律。E‑mail:liuhua77@upc.edu.cn。
编辑: 董奕含
收稿日期: 2023-12-24 修回日期: 2024-05-31
基金项目: |
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Received: 2023-12-24 Revised: 2024-05-31
为了揭示渤海湾盆地临南洼陷古近系沙河街组致密(低渗)砂岩油的差异富集机理,在依据空间配置和岩性组合划分源-储组合类型的基础上,综合利用测井、录井、试油和岩心分析测试资料,对不同源-储组合类型含油性及其供烃条件、储集条件、输导条件和运聚动力进行了分析,建立了致密(低渗)砂岩油差异富集模式。结果显示:①研究区存在源-储共生型(夹层型、互层型)、源-储紧邻型(源上型、源间型和源下型)、源-储间隔型(源下型)3大类6亚类源-储组合,对应3种致密(低渗)砂岩油富集模式。②源-储共生型具有“强供烃-强动力-高效充注-储集控富”模式,供烃条件和运聚动力最优,油气通过孔缝高效充注,储层含油性最好;相较于互层型,砂体厚度制约了夹层型油气富集规模。③源-储紧邻型具有“较强供烃-差异动力-联合输导-多元控富”模式,供烃条件较好,运聚动力变化大,油气通过孔缝-断裂-砂体联合输导,优先充注物性和孔隙结构好的储层,储层含油性较好;亚类中,源间型供烃条件和运聚动力优于源上型和源下型,含油性最好。④源-储间隔型具有“弱供烃-弱动力-断砂输导-输储控富”模式,供烃和运聚动力较弱,断裂、砂体组成的有效输导通道和优质储层发育对于油气富集至关重要,含油性整体较差。
关键词:
This study aims to reveal the differential oil enrichment mechanisms of tight (low-permeability) sandstone reservoirs in the Paleogene Shahejie Formation in the Linnan Sub-sag, Bohai Bay Basin. Initially, we categorize the source rock-reservoir assemblages in the Linnan Sub-sag based on their spatial distribution and lithologic combination. The analysis on oil-bearing properties, hydrocarbon supply, reservoir storage spaces, conduit system, and migration and accumulation dynamics of various source rock-reservoir assemblages is carried out using an integration of data of logging, well tests, production tests and core analysis and tests. Accordingly, the differential oil enrichment model is established for tight (low-permeability) sandstone reservoirs. The results indicate that the source rock-reservoir assemblages in the study area can be categorized into three types, which can be further divided into six subtypes: the source-reservoir coexistence type, including interbedded and intercalated sub-types; the source-reservoir adjoining type, comprising three distinct subtypes with reservoirs located above, between, or below source rocks; and the source-reservoir separation type, including a subtype with reservoirs located below source rocks. These types correspond to three oil enrichment model of the tight (low-permeability) sandstone reservoirs. The source-reservoir coexistence type exhibits an oil enrichment model featuring “a strong hydrocarbon supply, strong migration and accumulation dynamics, efficient charging, and reservoir-controlled oil enrichment.” Specifically, this type boasts the optimal hydrocarbon supply conditions, the strongest migration and accumulation dynamics, and efficient hydrocarbon charging via pores and fractures, all of which contribute to the most favorable oil-bearing properties. Compared to that of the intercalated subtype, the hydrocarbon enrichment scale of the interbedded subtype is restricted by sand-body thicknesses. The source-reservoir adjoining type manifests an oil enrichment model characterized by a comparatively strong hydrocarbon supply, differential migration and accumulation dynamics, combined conduit systems, and multiple factor-controlled oil enrichment. In detail, this type features a comparatively favorable hydrocarbon supply, significant changes in the migration and accumulation dynamics, and combined conduit systems consisting of pores, fractures, faults, and sand bodies, with hydrocarbon preferentially charging reservoirs with favorable physical properties and pore structures. This type of source rock-reservoir assemblage exhibits comparatively favorable oil-bearing properties. Among others, its subtype with reservoirs located between source rocks outperforms the other two subtypes in terms of both hydrocarbon supply and migration and accumulation dynamics, thus demonstrating the optimum oil-bearing properties. The source-reservoir separation type displays a pattern characterized by a weak hydrocarbon supply, weak migration and accumulation dynamics, conduit systems including faults and sand bodies, and oil enrichment under the control of conduits and reservoirs. Due to the weak hydrocarbon supply and migration and accumulation dynamics, effective transport pathways composed of faults and sand bodies, along with the presence of high-quality reservoirs, are crucial to hydrocarbon enrichment. This type of source rock-reservoir assemblage generally exhibits inferior oil-bearing properties.
Keywords:
本文引用格式
韩载华, 刘华, 赵兰全等.
HAN Zaihua, LIU Hua, ZHAO Lanquan, et al.
临南洼陷是渤海湾盆地重要的含油气洼陷,沙河街组沙三中亚段—沙四上亚段致密(低渗)砂岩油资源丰富,多套烃源岩与储层相互叠置、连片分布,构成了相对复杂的源-储配置关系,储层含油性差异显著,加大了勘探开发难度。本次研究利用胜利油田勘探开发研究院提供的测井、录井、试油和物性资料,基于中国石油大学(华东)深层油气全国重点实验室开展的烃源岩地化、储层物性、薄片观察、压汞分析测试资料,通过划分不同的源-储组合类型,探讨了致密(低渗)砂岩油差异富集条件,以期揭示该地区致密(低渗)砂岩油差异富集机制,为研究区及类似地区的油气勘探开发提供理论指导。
1 地质概况
图1
图1
临南洼陷构造特征及致密(低渗)砂岩油分布(a)与地层发育特征(b)
Fig.1
Structural characteristics and oil distribution in tight (low-permeability) sandstone reservoirs (a) and stratigraphic column (b) of the Linnan Sub-sag
临南洼陷沙三中亚段—沙四上亚段存在多套烃源岩,其中沙三下亚段上部1层组和3层组发育深湖-半深湖相泥页岩,在研究区分布稳定,厚度范围分别为30~150 m和20~120 m;总有机碳含量(TOC)介于0.1 %~19.2 %,平均2.9 %;有机质类型以Ⅰ-Ⅱ1型为主,镜质体反射率(Ro)分布在0.66 %~1.18 %,主体进入生油高峰,供油能力强,油源对比已证实其为研究区主力烃源岩[20]。其余层系泥岩非均质性强,生油能力极不均衡,可在局部地区形成有效烃源岩。
沙三中亚段—沙四上亚段沉积的源内和近源的浊积砂体、三角洲前缘砂体是致密(低渗)油勘探的主要对象,储层渗透率介于(0.009~922.700)
2 源-储组合类型与含油性差异
2.1 源-储组合类型及特征
临南洼陷除沙三下亚段上部,其余层系内的泥岩多数不具备生油能力,致密砂岩油主要表现为源外富集,因此难以简单依据源-储岩性组合进行划分;而与烃源岩直接接触的砂体占比较少,非直接接触砂体占多数,若依据源-储接触关系进行划分,势必会导致不同类型所涵盖的体量差异过大。因此,笔者以沙三中亚段、沙三下亚段上部、沙三下亚段下部、沙四上亚段为基本单元,建立了基于源-储空间配置和岩性组合的源-储组合类型划分方案。
利用TOC测井评价技术识别烃源岩层段(TOC≥1.0 %),利用测录井资料识别储层段,依据烃源岩层段与储层段的空间配置关系,将源-储组合类型划分为源-储共生型,源-储紧邻型和源-储间隔型。依据源-储岩性组合关系并参考砂-泥结构[21],将源-储共生型进一步划分为夹层型(砂/地比<30 %)和互层型(砂/地比≥30 %)2个亚类,按照《页岩油地质评价方法》国家标准[22]对页岩油的定义,去除夹层型中砂体厚度小于5 m的组合;依据源-储相对位置,将源-储紧邻型和源-储间隔型进一步划分为源上型、源间型和源下型亚类。依据上述划分方案,将临南洼陷沙三中亚段—沙四上亚段划分为3大类6亚类源-储组合类型(图2)。
图2
图2
临南洼陷源-储组合类型划分方案
Fig.2
Classification scheme for source rock-reservoir assemblages in the Linnan Sub-sag
统计结果表明,研究区源-储组合类型中源-储紧邻型平面分布最为广泛,多与三角洲前缘亚相及浊积扇相砂体对应,占比69.1 %,其中源上型占比19.1 %,源间型占比16.7 %,源下型占比33.3 %;源-储共生型分布相对局限,通常与深水重力流浊积砂体对应,占比为18.0 %,其中夹层型占比10.3 %,互层型占比7.7 %;由于钻井深度限制,源-储间隔型占比为12.9 %。研究区源-储配置关系的层控性较强,垂向上表现为自上至下存在源-储紧邻源上、源间、源下型和源-储间隔源下型叠置分布(可能存在缺失);而源-储共生型主要集中分布在沙三下亚段上部及沙三中亚段等烃源岩发育层段(图3)。
图3
图3
临南洼陷源-储组合分布特征
a.源-储组合平面分布;b.源-储组合剖面分布(剖面位置见图3a)
Fig.3
Distributions of source rock-reservoir assemblages in the Linnan Sub-sag
2.2 源-储组合与含油性
油气显示比例是指具有油气显示(油浸、油斑、油迹、荧光)的砂体厚度与总砂体厚度的比值[23],可用于综合表征源-储组合内多套砂体的含油性。含油饱和度是表征储层含油性的常用定量参数,可反映不同砂体之间及砂体内部的含油性差异。试油产量用于表征油层生产能力,是油层含油性、地层能量和流体性质等因素的综合反映。通过对研究区32口探井的含油性进行定量分析,发现不同源-储组合类型之间差异明显。
图4
图4
临南洼陷不同源-储组合油气显示比例特征
a.油气显示比例分布柱状图;b.油气显示比例井数占比饼状图;c.油气显示比例与油气显示厚度交会图
Fig.4
Hydrocarbon show proportions of various source rock-reservoir assemblages in the Linnan Sub-sag
图5
图5
临南洼陷不同源-储组合含油饱和度(a)和平均日产液量分布(b)
Fig.5
Distributions of oil saturation (a) and average daily liquid production (b) of the various source rock-reservoir assemblages in the Linnan Sub-sag
3 致密(低渗)油差异富集条件
3.1 供烃条件
供烃条件是致密(低渗)砂岩油富集的物质基础,具有重要的控制作用。综合考虑烃源岩特征及致密(低渗)油勘探实际,将研究区烃源岩划分为两类:TOC>2.0 %,Ro>0.7 %划定为优质烃源岩;TOC介于1.0 %~2.0 %,Ro介于0.5 %~0.7 %划定为普通烃源岩。
不同源-储组合烃源岩厚度和品质差异会影响供烃效率和强度,进而影响储层含油性。①源-储共生型烃源岩平均厚度180.6 m,优质烃源岩供烃占比70.0 %(图6),储层与烃源岩直接接触,供烃条件和含油性最好;在其2个亚类中,夹层型优质烃源岩供烃占比更大,供烃条件优于互层型。②源-储紧邻型烃源岩平均厚度100.9 m,优质烃源岩供烃占比70.0 %(图6),储层位于烃源岩层外,源-储接触面积显著减小,供烃条件整体弱于源-储共生型,含油性次之;在其3个亚类中,源间型可同时接受上下两套烃源岩供烃,供烃条件好于源上型和源下型。③源-储间隔型烃源岩厚度和优质烃源岩占比分别为66.9 m和42.8 %(图6),储层与烃源岩层分离,整体供烃条件和含油性较差。
图6
图6
临南洼陷不同烃源岩厚度、品质下各源-储组合类型含油饱和度统计
Fig.6
Statistics of oil saturation of various source rock-reservoir assemblages with different thicknesses and quality of source rocks in the Linnan Sub-sag
此外,随着烃源岩厚度增大,源-储共生和源-储紧邻型储层含油饱和度呈现逐渐增加的趋势;在厚度相近的情况下,优质烃源岩供烃比例更大的源-储组合往往具有更好的含油性(图6)。源-储间隔型则无以上规律,进一步统计发现其含油性随着源-储距离增大而明显变差,分析原因可能是其原油富集受到供烃条件外的其他因素控制更为明显,较大的源-储距离会加大这些因素的控制效应。
3.2 运聚动力条件
笔者通过郭小文等(2011)[33]提出的定量模型计算了研究区沙三中亚段—沙四上亚段烃源岩理论生烃增压量,并将其作为致密(低渗)油运聚的主要动力。计算结果表明,研究区沙三中亚段—沙四上亚段优质烃源岩生烃增压量介于6.0~20.7 MPa,普通烃源岩则介于1.8~12.4 MPa,生烃能力更强的优质烃源岩明显产生了更大的超压。
源-储共生型油气运聚动力为源-储剩余压力差,而对于储层位于烃源岩层外的源-储紧邻型和源-储间隔型而言,难以用源-储剩余压力差表征运聚动力。因此,本次研究引入源-储剩余压力梯度的概念表征运聚动力(
式中:烃源岩剩余压力ps取烃源岩生烃增压量,MPa;储层剩余压力pr取储层段实测剩余压力,MPa;源-储距离L取源岩顶(底)面至储层段中点距离,km。
计算结果表明,源-储共生型源-储剩余压力差介于3.0~16.9 MPa之间,平均8.0 MPa,运聚动力条件和含油性最好,夹层型亚类略大于互层型(图7a)。源-储紧邻型源-储剩余压力梯度变化较大,介于18~465 MPa/km,平均155 MPa/km,含油性次之;在其3个亚类中,源-储剩余压力梯度源间型>源下型>源上型(图7b)。源-储间隔型源-储剩余压力梯度普遍较小,介于5~60 MPa/km,平均30 MPa/km,运聚动力条件和含油性较差(图7b)。此外,随着源-储剩余压力差和剩余压力梯度增大,各源-储组合亚类中油气显示比例均具有增大趋势。由此表明,运聚动力条件是导致致密(低渗)油差异富集的重要因素之一。
图7
图7
临南洼陷致密(低渗)砂岩油运聚动力与油气显示比例关系
a.源-储剩余压力差与油气显示比例关系;b.源-储剩余压力梯度与油气显示比例关系
Fig.7
Relationship between the migration and accumulation dynamics of oil in tight (low-permeability) sandstone reservoirs and the hydrocarbon show proportions in the Linnan Sub-sag
3.3 油气输导条件
断层、裂缝和砂体是临南洼陷油气运移的主要输导要素[35-37]。由于烃源岩和储层的空间位置不同,不同源-储组合的输导要素及组合情况存在明显差异。综合考虑以上因素,将研究区致密(低渗)砂岩油输导模式划分为:孔缝输导模式、孔缝-断裂-砂体联合输导模式和断裂-砂体输导模式。①源-储共生型对应孔缝输导模式。岩心观察表明烃源岩层内部主要发育层理缝和低角度缝(图8a),生成的油气通过裂缝排出后直接向相邻砂体充注,然后通过砂体内的孔隙和裂缝运移和聚集(图8g),油气运移距离最短、运移效率最高。②源-储紧邻型对应孔缝-断裂-砂体联合输导模式。对于与烃源岩直接接触的砂体,油气通过孔隙和裂缝从烃源岩层排出后,直接充注进入砂体运移和聚集;而未与烃源岩直接接触的砂体,断层和砂岩层段内发育的高角度、斜交构造裂缝和微裂缝提供了高效的油气垂向运移通道(图8b—f),油气通过断层、裂缝、渗透性砂体输导运移后在储层内聚集。③源-储间隔型对应断裂-砂体输导模式。油气排出后必须通过断层、裂缝、渗透性砂体输导运移后才能成藏,油气运移距离较远,运移效率低。
图8
图8
临南洼陷沙三段—沙四段泥页岩与致密(低渗)砂岩储层裂缝特征
a.泥页岩层理缝及低角度缝,商741井,埋深3 350.0~3 353.0 m,岩心照片;b.砂岩内高角度缝、斜交缝,源-储紧邻源间型,街503井,埋深3 848.1~3 852.1 m,岩心照片;c.砂岩内高角度缝、斜交缝,源-储紧邻源下型,街4井,埋深3 956.5~3 958.0 m,岩心照片;d.微裂缝内充填沥青,街5井,埋深3 933.6 m,源-储紧邻源间型,单偏光显微镜下照片;e.微裂缝内充填沥青,街5井,埋深3 978.0 m,源-储紧邻源间型,单偏光显微镜下照片;f.砂岩内微裂缝,夏942井,埋深3 800.8 m,源-储紧邻源下型,单偏光显微镜下照片;g.砂岩内微裂缝,夏斜352井,埋深3 826.8 m,源-储共生互层型,扫描电镜照片
Fig.8
Fractures in shales and tight (low-permeability) sandstone reservoirs in the 3rd and 4th members of the Shahejie Formation in the Linnan Sub-sag
可以看出,源外成藏的源-储紧邻型和源-储间隔型对输导条件要求较高,各输导要素的发育及组合情况控制了油气的运移范围与效率,例如夏46井和街501井区分别由于断裂和叠置砂体发育,均在相对远源的源-储间隔型储层内发现良好的油气显示。
3.4 储集条件
3.4.1 砂体厚度
图9
图9
临南洼陷不同源-储组合类型砂体厚度对比
a.砂体累计厚度;b.单砂体厚度
Fig.9
Histogram showing the sand-body thicknesses of different source rock-reservoir assemblages in the Linnan Sub-sag
3.4.2 储层物性
物性是评价储层品质的宏观参数[39-40],由于沉积类型、埋深、成岩作用的不同,临南洼陷致密(低渗)油层段不同源-储组合类型的储层物性存在一定差异。整体来看,储层物性非均质性较强,其中源-储紧邻型储层物性最好,平均孔隙度12.5 %,渗透率中值0.58
图10
图10
临南洼陷源-储紧邻型源-储组合各亚类储层物性与含油性关系
a.源上型;b.源间型;c.源下型
Fig.10
Relationships of the physical and oil-bearing properties of reservoirs in the three subtypes of the source-reservoir adjoining type in the Linnan Sub-sag
3.4.3 储层孔隙结构
图11
图11
临南洼陷致密(低渗)砂岩储层孔隙发育特征及含油性差异显微照片
a.残余粒间孔与次生溶蚀孔发育,内部赋存沥青,街503井,埋深4 047.3 m,源-储紧邻源下型,油浸,单偏光;b.残余粒间孔发育,夏942井,埋深3 800.8 m,源-储紧邻源下型,油斑,扫描电镜;c.镜下孔隙发育较差,夏99井,埋深4 253.2 m,源-储紧邻源下型,油迹,单偏光;d.次生溶蚀孔隙发育,临82井,埋深3 869.6 m,源-储共生夹层型,油浸,单偏光;e.石英晶间孔发育,夏斜352井,埋深3 826.8 m,源-储共生互层型,荧光,扫描电镜;f.孔隙不发育,夏斜961井,埋深3 449.8 m,源-储间隔源下型,无显示,单偏光
Fig.11
Micrographs showing pore developmental characteristics and oil-bearing property differences of tight (low-permeability) sandstone reservoirs in the Linnan Sub-sag
图12
图12
临南洼陷致密(低渗)砂岩储层孔隙结构特征
a,b.源-储共生型;c,d.源-储紧邻型;e,f.源-储间隔型
Fig.12
Pore structural characteristics of tight (low-permeability) sandstone reservoirs in the Linnan Sub-sag
综合来看,源-储紧邻型储集条件好于源-储共生型和源-储间隔型。致密(低渗)砂岩储层物性和孔隙结构决定了各源-储组合内部的油气聚集次序,油气优先富集于物性和孔隙结构较好的储层“甜点”段。
4 致密(低渗)油差异富集模式
基于临南洼陷沙三中亚段—沙四上亚段不同源-储组合类型的含油性统计和“源、压、输、储”差异富集条件的分析(表1),笔者建立了3种致密(低渗)砂岩油差异富集模式。
表1 临南洼陷不同源-储组合类型含油性和油气富集条件对比
Table 1
源-储组合类型 | 源-储共生型 | 源-储紧邻型 | 源-储间隔型 | |
---|---|---|---|---|
含油性 | 油气显示比例/% | 28.0~100.0 | 9.0~78.0 | 2.5~25.0 |
含油饱和度/% | 22~83 | 17~75 | 2~51 | |
平均日产油量/t | 11.4 | 6.4 | 1.1 | |
供烃条件 | 平均烃源岩厚度/m | 180.6 | 100.9 | 66.9 |
优质烃源岩占比/% | 70.0 | 70.0 | 42.8 | |
运聚动力条件 | 源-储剩余压力差/ MPa | 3.0~16.9 | — | — |
源-储剩余压力梯度/(MPa/km) | — | 18~465 | 5~60 | |
输导条件 | 孔缝输导 | 孔缝-断裂-砂体联合输导 | 断裂-砂体输导 | |
储集条件 | 砂体平均累计厚度/m | 43.8 | 75.7 | 72.9 |
单砂体厚度/m | >5 | 0~6 | 0~6 | |
平均孔隙度/% | 9.6 | 12.5 | 8.5 | |
渗透率中值/( | 0.50 | 0.58 | 0.32 | |
孔隙特征 | 次生溶蚀孔和晶间孔增多 | 残余粒间孔和次生溶蚀孔为主 | 次生溶蚀孔和晶间孔增多 |
4.1 强供烃-强动力-高效充注-储集控富模式
该富集模式对应源-储共生型组合,主要分布在沙三中亚段、沙三下亚段上部的烃源岩层内,属于源内富集,油源充足,运聚动力强,油气在源-储剩余压力差驱动下通过孔隙和裂缝从烃源岩充注进入相邻储层运移,受储层非均质性影响,优先在厚层、优质储层内聚集(图13)。油气富集规模主要受控于储集条件,储层发育厚度大、质量好时形成源-储互层强富集;储层发育厚度较小时,一般形成夹层较强富集。
图13
图13
临南洼陷沙三中亚段—沙四上亚段致密(低渗)砂岩油富集模式
①源-储共生夹层较强富集;②源-储共生互层强富集;③源-储紧邻源上较强富集;④源-储紧邻源间强富集;⑤源-储紧邻源下较强富集;⑥源-储间隔源下弱富集
Fig.13
Oil enrichment model of tight (low-permeability) sandstone reservoirs in the middle submember of the 3rd member to the upper submember of the 4th member of the Shahejie Formation in the Linnan Sub-sag
4.2 较强供烃-差异动力-联合输导-多元控富模式
该富集模式对应源-储紧邻型组合,主要分布在沙三中亚段—沙三下亚段的非烃源岩层段内,属于源外富集,供烃条件整体较好,内部运聚动力变化大,油气从烃源岩层排出后在超压驱动下向剩余压力较小的储层段运移,并且随着源-储距离增大,动力不断衰减;若储层与烃源岩直接接触,油气通过孔缝输导充注进入储层;若不直接接触,则需通过断裂、砂体等进行运移。利用包裹体测温结合埋藏史-热史模拟可知,研究区致密(低渗)砂岩油主成藏期为馆陶晚期至今,油气运移过程与断裂活动期匹配良好[32](图14)。由于相较于其他源-储组合其储层储集能力更优,油气经过运移后优先在物性和孔隙结构较好的储层“甜点”段聚集(图13)。在该模式下油气富集受到供烃、动力、输导、储集等多种因素控制明显,邻近优质烃源岩层或油源断裂的储层“甜点”段是有利勘探目标。亚类中,源间型整体富集条件最优,含油性最好,形成源间强富集,源上型和源下型则形成较强富集。
图14
图14
临南洼陷致密(低渗)砂岩油成藏期与断裂活动匹配关系
Fig.14
Matching relationship between the accumulation stages of oil in tight (low-permeability) sandstone reservoirs and faulting activity in the Linnan Sub-sag
4.3 弱供烃-弱动力-断砂输导-输储控富模式
5 结论
1) 临南洼陷沙三中亚段—沙四上亚段存在源-储共生型(夹层型、互层型)、源-储紧邻型(源上型、源间型和源下型)、源-储间隔型(源下型)3大类6亚类源-储组合类型。源-储共生型整体含油性最好,源-储紧邻型次之,源-储间隔型较差;亚类中以源-储共生互层型和源-储紧邻源间型含油性最好。
2) 源-储共生型具有最好的供烃条件和运聚动力条件,油气通过孔缝输导高效充注,砂体厚度制约了夹层型亚类油气富集规模;源-储紧邻型具备较好的供烃条件,运聚动力变化大,油气通过孔缝-断裂-砂体联合输导,优先充注物性和孔隙结构好的储层,油气富集受多因素控制,源间型亚类富集条件优于源上型和源下型;源-储间隔型整体供烃和运聚动力较弱,有效输导通道和优质储层发育对于油气富集至关重要。
3) 建立了临南洼陷3种致密(低渗)砂岩油富集模式:强供烃-强动力-高效充注-储集控富模式、较强供烃-差异动力-联合输导-多元控富模式和弱供烃-弱动力-断砂输导-输储控富模式。
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