不同岩相泥页岩生烃能力与含油性特征——以玛湖凹陷风城组玛页1井为例

Hydrocarbon generation capacity and oil-bearing properties of shale with different lithofacies: a case study of well Maye 1 in Fengcheng Formation, Mahu Sag

摘要

以玛湖凹陷玛页1井风城组岩心为研究对象，采用全岩 X 线衍射、薄片观察、岩石热解和多温阶热解等方法，在岩相划分的基础上，分析不同岩相泥页岩生烃能力与含油性特征。结果表明：玛湖凹陷风城组主要发育块状长英质泥岩、块状云质泥岩、纹层状长英质泥岩、纹层状灰质泥岩、纹层状云质泥岩、树根状泥岩和雪花状泥岩 7 类岩相；纹层状长英质泥岩、纹层状灰质泥岩、纹层状云质泥岩、树根状泥岩和雪花状泥岩为中等一好烃源岩，块状云质泥岩为差一中等烃源岩，块状长英质泥岩烃源岩品质差。纹层状长英质泥岩、纹层状云质泥岩、树根状泥岩和雪花状泥岩含油性和可动性好，为页岩油甜点岩相；生烃能力、排烃和外来烃运移是影响泥岩含油性与可动性的主要因素。玛页 1 井风城组深度在 4625.0 \sim 4635.0 \mathrm{、} 4665.0 \sim 4685.0 和 4730.0 \sim 4770.0 \mathrm{m} 之间发育优势岩相，为页岩油勘探开发的有利层段。该结果为玛湖凹陷风城组页岩油下一步勘探部署与有效开发提供依据。

Abstract

The study on hydrocarbon generation capacity and oil-bearing properties of shale with different lithofacies is of great significance to the evaluation of high-quality source rocks. Mudstone samples from well Maye 1, Fengcheng Formation, Mahu Sag, were selected to determine the hydrocarbon generation capacity and oil-bearing properties of shale with different lithofacies through X-ray diffraction, thin section observation, rock pyrolysis and multi-temperature pyrolysis. The results show that mudstones of Fengcheng Formation in Mahu Sag can be divided into 7 types of lithofacies: massive felsic mudstone, massive dolomitic mudstone, laminated felsic mudstone, laminated calcareous mudstone, laminated dolomitic mudstone, tree-root shaped mudstone and snowflake mudstone. The laminated felsic mudstone, laminated calcareous mudstone, laminated dolomitic mudstone, tree-root shaped mudstone and snowflake mudstone are medium-good source rocks. The source rock quality of massive dolomitic mudstone is poor-medium source rock. The massive felsic mudstone is poor source rock. The laminated felsic mudstone, laminated dolomitic mudstone, tree-root shaped mudstone and snowflake mudstone are the sweet facies of shale oil with high oil content and good mobility. Hydrocarbon generation capacity, hydrocarbon expulsion and hydrocarbon migration are the main factors affecting the oil content of mudstones. The depth intervals of 4625.0-4635.0,4665.0-4685.0 and 4730.0-4770.0 m of well Maye 1 are favorable for shale oil exploration and development, which dominant lithofacies developed at. The research results can provide theoretical basis and technical support for further exploration and development of the shale oil in the Fengcheng Formation, Mahu Sag.

关键词

玛湖凹陷 / 风城组 / 玛页1井 / 页岩油 / 岩相 / 生烃能力 / 含油性

Key words

Mahu Sag / Fengcheng Formation / well Maye 1 / shale oil / lithofacies / hydrocarbon generation capacity / oil-bearing properties

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基金资助

国家自然科学基金项目(42090022)

中国石化勘探开发研究院重点课题(YK-2023-18)