玛页1井风城组页岩油藏地质特征及甜点评价

doi:10.7657/XJPG20220609

摘要/Abstract

摘要：

玛湖凹陷风城组是一套以湖相暗色泥页岩与白云质岩为主的碱湖优质烃源岩，页岩油资源量大，是准噶尔盆地十分有潜力的非常规勘探领域。为明确其地质特征，针对玛页1井风城组连续取心资料，通过岩心观察、薄片鉴定、全岩分析、岩石热解、干酪根镜检、脆性评价等手段，对比分析了风城组各亚段的沉积环境、优势岩性、烃源岩品质、储集性能、天然裂缝特征、脆性和可动性。结果表明，风城组细粒沉积岩按岩石组分和层理构造可划分为12种岩石类型，结合沉积环境可将风城组划分为淡水、咸化、蒸发盐岩、弱咸化和低盐度5类沉积组合，对应风城组5个沉积亚段；风三₃亚段为一套有机质丰度中等、以Ⅱ₁型和Ⅰ型干酪根为主的成熟烃源岩，发育纹层状混积岩优势储集层，裂缝和溶孔发育，物性和含油性好，脆性指数大，油气可动性强，具有利于页岩油富集的生烃、储集等诸多优势条件，是玛湖凹陷风城组页岩油下步勘探开发的重点。

关键词: 玛湖凹陷, 玛页1井, 风城组, 页岩油, 沉积组合, 地质特征, 甜点评价, 烃源岩

Abstract:

The Fengcheng formation in the Mahu sag is a set of high-quality alkaline lake source rocks dominated by lacustrine dark shale and dolomitic rocks, which contains a large quantity of shale oil resources and is a field with great potential for unconventional hydrocarbon exploration in the Junggar basin. It is necessary to clarify the geological characteristics and evaluate the sweet spots in the Fengcheng formation. Based on the continuous coring data from the Fengcheng formation in Well Maye-1, and by means of core observation, thin section identification, whole rock analysis, rock pyrolysis, kerogen microscopy, and brittleness evaluation, the sedimentary environment, dominant lithology, source rock quality, accumulation performance, natural fractures, brittleness and mobility of each submember of the Fengcheng formation were compared and analyzed. The results show that the fine-grained sedimentary rocks in the Fengcheng formation can be divided into twelve rock types according to mineral composition and bedding structure, and into five kinds of sedimentary assemblage according to sedimentary environment, that is, freshwater, salinity, evaporite, weak salinization and low salinity assemblage, which correspond to five sedimentary submembers of the Fengcheng formation. A set of mature source rocks with moderate abundance of organic matters dominated by type Ⅱ₁ and type Ⅰ kerogens is found in the Feng 3₃ submember. Furthermore, the Feng 3₃ submember contains lamellar diamictite reservoirs with abundant fractures and dissolved pores, favorable physical and oil-bearing properties, high brittleness index, and strong oil and gas mobility. Thus, the Feng 3₃ submember has the favorable conditions of hydrocarbon generation and accumulation for shale oil and should be considered as the focus for subsequent shale oil exploration and development.

Key words: Mahu sag, Well Maye-1, Fengcheng formation, shale oil, sedimentary assemblage, geological characteristic, sweet spot evaluation, source rock

中图分类号:

TE122

邹阳, 戚艳平, 宋栋, 陈文顺, 韦盼云. 玛页1井风城组页岩油藏地质特征及甜点评价[J]. 新疆石油地质, 2022, 43(6): 714-723.

ZOU Yang, QI Yanping, SONG Dong, CHEN Wenshun, WEI Panyun. Geological Characteristics and Sweet Spot Evaluation of Shale Oil Reservoir in Fengcheng Formation in Well Maye-1[J]. Xinjiang Petroleum Geology, 2022, 43(6): 714-723.

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