| 鄂尔多斯盆地镇泾区块延长组长8油层组砂岩储层特征 |
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| 引用本文： | 张霞,林春明,陈召佑,潘峰,周健,俞昊.鄂尔多斯盆地镇泾区块延长组长8油层组砂岩储层特征[J].高校地质学报,2012,18(2):328-340. |
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| 作者姓名： | 张霞 林春明 陈召佑 潘峰 周健 俞昊 |
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| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室，南京大学 地球科学与工程学院 |
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| 基金项目： | 国家自然科学基金，教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | 延长组长8 油层组是鄂尔多斯盆地镇泾区块的主力油层之一，岩性以岩屑长石砂岩和长石岩屑砂岩为主，为典型的
特低孔特低渗储层。储集空间以次生溶蚀粒间孔为主，喉道以缩颈型、片状和弯片状为主，孔喉结构发育3 种类型，以II
型为主。长8 砂岩储层特征主要受沉积作用、成岩作用、裂缝发育程度和油气充注4 个因素控制。最有利于储层发育的沉积
微相为水下分流河道，且中砂岩的储集物性好于细砂岩，富含石英、长石和变质岩岩屑的砂岩的储集物性好于火成岩岩屑、
沉积岩岩屑和云母含量高的砂岩。成岩作用对储集物性的影响具有双重性，建设性成岩作用包括溶解和孔隙衬里绿泥石胶
结作用2 种，两者均很发育的层段是油气储集的最有利地带；破坏性成岩作用主要包括机械压实作用和晚期亮晶方解石胶
结作用。裂缝以白垩纪末- 古近纪的构造裂缝为主，其使长8 储层渗透率急剧增大，储层非均值性增强。油气充注对储集
物性的影响主要表现为促进溶解作用的发生以及次生孔隙的形成和保存。
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| 关 键 词： | 储层特征 控制因素 长8油层组 镇泾区块 鄂尔多斯盆地 |
The Reservoir Characteristics of Chang 8 Oil Layer Group From the Yanchang Formation in Zhenjing Area, Ordos Basin |
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| ZHANG Xia
,
LIN Chunming
,
CHEN Zhaoyou
,
PAN Feng
,
ZHOU Jian
,
YU Hao.The Reservoir Characteristics of Chang 8 Oil Layer Group From the Yanchang Formation in Zhenjing Area, Ordos Basin[J].Geological Journal of China Universities,2012,18(2):328-340. |
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| Authors: | ZHANG Xia LIN Chunming CHEN Zhaoyou PAN Feng ZHOU Jian YU Hao |
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| Institution: | State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering,;
Nanjing University, Nanjing |
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| Abstract: | The Chang 8 sandstones of the Yanchang Formation in Zhenjing area of Ordos Basin,occurring as one of the major reservoirs,mainly consist of feldspathic litharenite and lithic arkose.They belong to extra-low porosity and permeability reservoirs,with dissolved intergranular pores as the chief accumulation space,and the reduced-neck,lamellar and curved lamellar pore throat as the main throat type.Based on the pattern of capillary pressure curve,porosity,permeability,displacement pressure and pore throat radius,the Chang 8 sandstones can be classified as type I,II and III,in which the type II are the main reservoirs.There are four factors affecting the reservoir characteristics of Chang 8 sandstones:sedimentary processes,diagenesis,fractures,and hydrocarbon emplacement.The best reservoir quality is developed in the subaqueous distributary channels of braided river delta fronts,and the one of medium sandstones better than that of fine sandstones.Otherwise,the reservoir qualities of sandstones rich in quartz,feldspars and metamorphic rock fragments are better than those of sandstones with high contents of sedimentary and igneous rock fragments,as well as mica.The diagenetic processes have exerted dual impacts on the reservoir quality.The constructive one is characterized by dissolution and pore-lining chlorite cementation,and the sandstone intervals with them occurring together are the optimum zones for the oil and gas accumulation.The destructive one involves mechanical compaction and the late stage carbonate cementation.The fractures,with the NE-SW tectonic ones formed in the late stage of CretaceousPaleogene as the main type,contribute more to permeability than storage,making the heterogeneity of reservoirs intensified.The effects of hydrocarbon emplacement on reservoir quality are characterized by the reconstruction and conservation of porosity dissolved by organic acid in hydrocarbon. |
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| Keywords: | reservoir characteristics controlling factors Chang 8 sandstones Zhenjing area Ordos Basin |
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