柴北缘马海东地区元古界基岩储层发育特征及控制因素
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李军亮(1975—),男,山东安丘人,高级工程师,博士,从事石油天然气勘探地质综合研究。E-mail:lijunliang.slyt@sinopec.com。

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中国石化科技攻关项目“柴达木盆地中石化区块成藏条件与勘探潜力评价”(P18054-1),“柴达木及河西走廊地区油气资源潜力及选区评价”。


Characteristics and controlling factors of reservoirs in Proterozoic bedrock in Mahaidong area,northern margin of Qaidam Basin
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    摘要:

    元古界基岩潜山油气藏是柴达木盆地北缘马海东地区油气勘探的重要领域之一,储层是影响基岩储集体油气富集的主要因素之一。根据野外露头、岩心、薄片、扫描电镜和成像测井等资料,对基岩储层的发育特征及控制因素进行研究。结果表明:马海东地区元古界基岩储层发育片岩、片麻岩、榴辉岩和角闪岩等4大类9种岩性,裂缝和溶蚀孔等2大类6种储集空间类型,储层物性以低孔-(特)低渗透为主;基岩裂缝是影响溶蚀孔、溶蚀裂缝发育和储层能否获得高产的关键,裂缝的发育程度主要受岩性、构造2个因素的控制,脆性矿物含量高的片岩、片麻岩裂缝发育程度高,断裂级别越大、活动时间越长、距离断裂越近,裂缝发育程度越高;断裂上盘、断裂交汇处是优势储层发育区。

    Abstract:

    The buried-hill reservoir in Proterozoic bedrock is one of the important fields of oil and gas exploration in Mahaidong area,northern margin of Qaidam Basin,and the reservoir represents one of the main factors affecting oil and gas accumulation in bedrock. According to the data of the outcrop,core,thin section,scanning electron microscopy,imaging logging,etc.,the development and influencing factors of bedrock reservoirs were studied. The results demonstrate that the Proterozoic bedrock reservoirs in Mahaidong area developed 9 rock types in 4 categories,including schist,gneiss,eclogite,and amphibole,and 6 reservoir space types in 2 categories,including fractures and dissolution pores,and the reservoir petrophysical properties are dominated by low porosity and(extra-)low permeability. Moreover,the bedrock fracture is a key factor influencing the development of dissolution pores and dissolution fractures as well as the high yield of a reservoir. The development of fractures is mainly controlled by lithology and structure. Fractures of schist and gneiss with a high content of brittle minerals are highly developed,and more fractures are developed when they are closer to the fault at a higher grade and with a longer active time. In addition,the hanging wall and intersection of faults are the dominant development areas for reservoirs.

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李军亮.柴北缘马海东地区元古界基岩储层发育特征及控制因素[J].油气地质与采收率,2022,29(2):15~22

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  • 在线发布日期: 2022-06-21
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