摘要
哈山地区二叠系风城组页岩油勘探势头良好,多口页岩油探井取得突破。哈山地区风城组主要沉积陆源碎屑岩相、白云质混积岩相、含火山碎屑混积岩相和含碱性矿物混积岩相4类岩相,并发育多类型烃源岩。为进一步评价哈山地区风城组烃源岩品质及影响因素,以沉积背景入手,分岩相对风城组烃源岩进行精细评价,明确优质烃源岩的发育岩相,并在此基础上对烃源岩品质的影响因素进行分析,明确勘探方向。结果表明,哈山地区风城组含火山碎屑混积岩相泥页岩有机质丰度最好,白云质混积岩相泥页岩的生烃潜量最优,哈山地区风城组泥页岩干酪根主体为Ⅰ型−Ⅱ型,哈山西段泥页岩成熟度范围在0.79%~0.97%,哈山中段成熟度主要在1.2%~1.37%。哈山地区风城组烃源岩品质主要受沉积环境、生烃母质、成熟度、碱性矿物以及火山作用控制。白云质混积岩相、含碱性矿物混积岩相有机质在深水、还原环境、中−高盐度以及干燥条件下更为富集,陆源碎屑岩相以及含火山碎屑混积岩相在相对浅水、贫氧、低盐度、干旱−半干旱环境下有机质更为富集。沉积中心区高盐度区发育的绿藻(类杜氏藻)具有更高的油气转化率,使白云质混积岩相泥页岩在低丰度的有机质下具有较高的生烃潜量。成熟度以及碱性矿物的增加均会导致TOC、生烃潜量的测试值降低,适量的火山碎屑为有机质富集的有利条件。
Shale oil in the Permian Fengcheng Formation of the Hashan area shows promising momentum,with breakthroughs achieved in multiple wells.Previous research indicates that the Fengcheng Formation in the Hashan area is mainly composed of four lithofacies:terrigenous clastic lithofacies,dolomitic mixed lithofacies,volcanic clastic-bearing mixed lithofacies,and alkaline mineral-bearing mixed lithofacies,within which various types of source rocks have developed.[Objective]To further evaluate the quality of these source rocks and the factors controlling it,[Methods]this study investigates the sedimentary background and conducts a lithofacies-based evaluation.The aim is to identify lithofacies containing high-quality source rocks and to analyze the controlling factors of source rock quality,thereby clarifying the further exploration directions.[Results]The results show that,among the mudstones in the Fengcheng Formation of the Hashan area,the volcanic clastic-bearing mixed lithofacies has the highest total organic matter content,whereas the dolomitic mixed lithofacies has the greatest hydrocarbon generation potential.The kerogen of the mudstones in the Fengcheng Formation of the Hashan area is mainly TypeⅠ-Ⅱ.The mudstone maturity in the western section of Hashan area ranges from 0.79%to 0.97%Ro,while in the middle section,Ro is mainly between 1.2%and 1.37%.[Conclusion]The source rock quality in the Fengcheng Formation of the Hashan area is mainly controlled by sedimentary environment,hydrocarbon-generating parent material,maturity,alkaline minerals,and volcanic activity.Organic matter in dolomitic mixed lithofacies and alkaline mineral-bearing mixed lithofacies is more enriched in deep-water,reducing,medium-to-high salinity,and arid environments.In contrast,organic matter in terrigenous clastic lithofacies and volcanic clastic-bearing mixed lithofacies is more enriched in relatively shallow-water,oxygen-poor,low-salinity,and arid-semi-arid environments.Green algae(dunaliella-like)developed in high-salinity areas of the sedimentary center exhibit higher oil and gas conversion rates,enabling dolomitic mixed-lithofacies mudstones to have high hydrocarbon generation potential even with low organic matter abundance.Increased maturity and alkaline minerals reduce the measured TOC(total organic carbon)content and hydrocarbon generation potential,while an appropriate amount of volcanic clastics provides favorable conditions for the organic matter enrichment.
作者
孙中良
张奎华
宋振响
于洪洲
王斌
宋梅远
李志明
曹婷婷
SUN Zhongliang;ZHANG Kuihua;SONG Zhenxiang;YU Hongzhou;WANG Bin;SONG Meiyuan;LI Zhiming;CAO Tingting(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi Jiangsu 214126,China;Wuxi Research Institute of Petroleum Geology,RIPEP,SINOPEC,Wuxi Jiangsu 214126,China;SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi Jiangsu 214126,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying Shandong 257015,China;Shengli Oilfield Company,SINOPEC,Dongying Shandong 257015,China)
出处
《地质科技通报》
北大核心
2026年第1期38-52,共15页
Bulletin of Geological Science and Technology
基金
国家自然科学基金项目(42090020)
国家重点实验室项目(KLP24017)。
关键词
哈山地区
风城组
烃源岩
生烃母质
碱性矿物
火山作用
准噶尔盆地
Hashan area
Fengcheng Formation
source rock
hydrocarbon generation parent material
alkaline minerals
volcanism
Junggar Basin
