吉木萨尔凹陷页岩油是准噶尔盆地重要的油气勘探区域,近年来取得重大突破,以往的研究集中在沉积环境、岩石特征、微观孔隙结构等方面,而对页岩油储层演化特征及储层差异性的研究较为薄弱。为探讨研究区储层演化特征及差异性,选取吉木萨尔凹陷芦草沟组上“甜点”段典型岩心样品,通过岩石薄片、铸体薄片、X-衍射等研究手段,对吉木萨尔凹陷芦草沟组上“甜点”段页岩油储层特征、控制因素进行研究,并对储层演化特征及差异性进行分析。研究结果表明:芦草沟组上“甜点”段页岩油储层主要以砂屑云岩、长石岩屑砂岩、云质砂岩、粉砂质云岩及灰色泥岩为主,岩石矿物成分复杂;溶蚀孔、粒间孔和晶间孔为主要的储集空间类型,偶见少量裂缝发育;在酸碱流体多期演化作用下,储层经历了压实压溶、方解石和白云石胶结以及复杂交代等成岩演化过程,不同岩性储集层的物性、孔喉结构参数及测井响应特征存在差异。该研究为吉木萨尔芦草沟组页岩油的勘探开发提供了有利依据。
Shale oil reservoir in the Jimusaer Sag is an important hydrocarbon exploration area in the Junggar Basin. Major breakthroughs have been made in recent years. In the past, most studies focused on the sedimentary environment, rock characteristics, microscopic pore structure, etc., while few studies were conducted on the evolutionary characteristics and differences of shale oil reservoirs. In order to explore the evolutionary characteristics and differences of the reservoirs in the study area, the typical core samples were taken from the upper sweet spot interval of Lucaogou Formation in Jimusaer Sag, the characteristics and controlling factors of shale oil reservoirs in the upper sweet spot interval of Lucaogou Formation in Jimusaer Sag were studied by means of rock slice, casting sheet, X-ray diffraction, etc., as well as analyzing the evolutionary characteristics and differences of the reservoirs were analyzed. The results of the study showed that the shale oil reservoirs in the upper sweet spot interval of Lucaogou Formation were in complex rock mineral composition, mainly including dolomite, feldspathic lithic sandstone, dolomitic sandstone, silty dolomite and gray mudstone. The reservoir space type was dominated by dissolved pore, intergranular pore and intercrystalline pore, with a few fractures. After the multi-stage evolution of acid-base fluids, the reservoir experienced diagenetic evolutions such as compaction and pressolution, calcite and dolomite cementation, and complex metasomatism. There were differences in the physical properties, pore-throat structure parameters and logging response characteristics of the reservoirs with of different lithologies. This study provides a favorable basis for the exploration and development of shale oil reservoirs in Lucaogou Formation in Jimusaer.
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