首页|鄂尔多斯盆地陇东地区长71亚段源储结构与石油赋存关系研究

鄂尔多斯盆地陇东地区长71亚段源储结构与石油赋存关系研究

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为推进鄂尔多斯盆地延长组长7段致密油勘探,依托砂地比、岩石热解、生烃热模拟试验和测井、录井数据系统划分长71亚段源储结构,分析不同源储结构的烃源岩差异,探究其烃源岩对致密砂岩含油性的影响.结果表明,研究区主要发育源夹储型、源储互层型和储夹源型3类源储结构.由于生油母质的差异,页岩比泥岩具有更优的生排烃能力,源夹储型具有最好的自源供烃条件,其次为源储互层型与储夹源型.源储结构中砂体的含油性主要受控于烃源岩品质与储层物性的耦合关系,优质储层与中等品质源岩交互叠置的空间配置关系使得源储互层型的含油性较高且稳定,储夹源型中优质砂体与较差源岩的耦合导致了其含油性次之,而源夹储型中的差储层限制了其含油性.
The Difference of Source Rocks in Source-Reservoir Structure of Tight Sandstones of Chang 71 Submember and Its Influence on Hydrocarbon Enrichment,Longdong Area,Ordos Basin
The Member 7 in the Longdong area of the Ordos basin mainly develops semi-deep lacustrine-deep lacustrine shale,which is a significant target for tight oil exploration. Based on the sand-ground ratio and lithologic thickness,the source-reservoir structures of submember 71 were systematically divided. Based on the rock pyrolysis,hydrocarbon generation thermal simulation and logging data,the source rocks' differences of different source-reservoir structures of submember 71 were evaluated,and the influence of source rocks on the oil bearing property of tight sandstone was explored. The results show that the submember 71 of Yanchang Formation can be divided into three types of primary source reservoir structures,namely reservoir sandwiching source (Type 1),source reservoir interbedding (Type 2),and source sandwiching reservoir (Type 3). The black shale has better hydrocarbon generation and expulsion ability than the dark mudstone,which leads to the result that the Type 3 structure with high source-land ratio has the best hydrocarbon generation and expulsion,followed by the Type 2 structure and Type 1 structure. The oil bearing property of tight sand in different source-reservoir structure is mainly controlled by the coupling relationship between source rock quality and reservoir physical properties. The high-quality reservoir and medium quality source rock in Type 2 structure make it stable with high oil-bearing property. For the Type 1 structure,the coupling between the high property sand bodies (>6％) and the adjacent poor source rocks results in the large variation of oil saturation (13％-53％). The poor properties of the Type 3 structure's reservoir limit its oil enrichment.

Ordos basintight oilsandstonesource-reservoir structurehydrocarbon generation and expulsion capacity of source rockdifference in oilinesspetroleum geology

成铭、陈冬霞、雷文智、姚东升、王福伟、解广杰

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中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249

中国石油大学(北京)地球科学学院,北京 102249

鄂尔多斯盆地 致密油 砂岩 源储结构 源岩生排烃能力 含油性差异 石油地质

中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项

ZLZX2020-02-01-03

2024

10.3799/dqkx.2023.085

地球科学
中国地质大学

地球科学

CSTPCD北大核心
影响因子：1.447
ISSN：1000-2383
年,卷(期)：2024.49(9)
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