| 鄂尔多斯盆地中部气田区中奥陶统马家沟组马五5-马五1亚段储层孔隙类型和演化 |
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| 引用本文： | 方少仙,何江,侯方浩,杨西燕,乔琳,傅锁堂,姚泾利,吴正,阎荣辉,徐黎明.鄂尔多斯盆地中部气田区中奥陶统马家沟组马五5-马五1亚段储层孔隙类型和演化[J].岩石学报,2009,25(10):2425-2441. |
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| 作者姓名： | 方少仙 何江 侯方浩 杨西燕 乔琳 傅锁堂 姚泾利 吴正 阎荣辉 徐黎明 |
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| 作者单位： | 西南石油大学, 成都 610500;西南石油大学, 成都 610500;西南石油大学, 成都 610500;西南石油大学, 成都 610500;西南石油大学, 成都 610500;中国石油天然气股份有限公司长庆油田分公司, 西安 710021;中国石油天然气股份有限公司长庆油田分公司, 西安 710021;中国石油天然气股份有限公司长庆油田分公司, 西安 710021;中国石油天然气股份有限公司长庆油田分公司, 西安 710021;中国石油天然气股份有限公司长庆油田分公司, 西安 710021 |
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| 基金项目： | 四川省重点学科建设项目(编号SZD0414)资助 |
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| 摘 要： | 鄂尔多斯盆地中奥陶统马家沟组最上部的马五5-马五1亚段为盆地内中部气田区主要的天然气储产层之一,厚度70~80米,面积约4.8×104平方千米。储集岩主要的原始岩性为不同程度地存在晶间孔隙的含硬石膏柱状晶和结核的粉晶白云岩和粗粉晶白云岩。中奥陶世末至中石炭世,经历了140余Ma的表生裸露期成岩作用,古风化壳岩溶十分强烈,特别是在含硬石膏柱状晶和结核的粉晶白云岩中形成广布于气田区的形式多样的储集空间类型。埋藏成岩作用次生溶蚀孔隙主要叠加于古风化壳岩溶所形成的孔、缝及洞中,使其再次扩溶,或使孔、缝及洞中半充填的沉积物再次溶解或部分溶解。印支期产生的80°方向和燕山期30°和60°方向的共轭裂隙,亦以在古岩溶作用较强烈、并存在孔隙的岩性中较明显。从岩芯和铸体薄片中识别出21种孔、洞、缝和裂隙,包括沉积(准同生)期的原生孔隙3种; 表生裸露成岩期次生孔隙9种; 埋藏成岩期次生孔隙5种; 构造裂隙和断层4种。在同一块岩芯,甚至同一块铸体薄片中,常可见到不同成岩期次的多种孔隙类型叠加和同时出现。在中部气田区,各种孔隙空间的发育程度,分布范围和对储层的贡献值是不一样的,是导致储层的非均质性的主要原因之一。
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| 关 键 词： | 鄂尔多斯盆地 中部气田 马家沟组 孔隙类型 演化 |
Reservoirs pore space types and evolution in M55 to M51 submembers of Majiagou Formation of Middle Ordovician in central gasfield area of Ordos basin. |
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| FANG ShaoXian,FANG ShaoXian,HOU FangHao,YANG XiYan,QIAO Lin,FU SuoTang,YAO JingLi,WU Zheng,YAN RongHui and XU LiMing.Reservoirs pore space types and evolution in M55 to M51 submembers of Majiagou Formation of Middle Ordovician in central gasfield area of Ordos basin.[J].Acta Petrologica Sinica,2009,25(10):2425-2441. |
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| Authors: | FANG ShaoXian FANG ShaoXian HOU FangHao YANG XiYan QIAO Lin FU SuoTang YAO JingLi WU Zheng YAN RongHui and XU LiMing |
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| Institution: | Southwest Petroleum University, Chengdu 610500, China;Southwest Petroleum University, Chengdu 610500, China;Southwest Petroleum University, Chengdu 610500, China;Southwest Petroleum University, Chengdu 610500, China;Southwest Petroleum University, Chengdu 610500, China;Changqing Oilfield Company, CNPC Xi'an 710021, China;Changqing Oilfield Company, CNPC Xi'an 710021, China;Changqing Oilfield Company, CNPC Xi'an 710021, China;Changqing Oilfield Company, CNPC Xi'an 710021, China;Changqing Oilfield Company, CNPC Xi'an 710021, China |
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| Abstract: | The upperest part M55-M51 submembers of Middle Ordovician Majiagou Formation is one of mainly reservoir and producting horizon in central gasfield area of Ordos Basin, the thickness is 70~80M, and area about 4.8×104 Km2. The main primary lithological characters of reservoirs are containing anhydrite crystal and nodules silt-sized crystal dolostone and coarser silt-crystal dolostone contain more or less intercrystal pores. Subaerial exposure and kastfication more than 140Ma from late Ordovician to middle Carboniferous, the phenomenon of palaeokasting was very strong, especially in silt-sized crystal dolostone with anhydrite crystal and nodules, formed various reservoir space types and widely apperence in whale central gas field area. The secondary pores developed from burial diagenesis stage always stacking at the early pore spaces, were mainly take shaped in palaeokastic rocks. Such as the anhydrite nodule cast pores enlargement resolution, resolution or partly resolution of the sediments subfilled in the palaeokastic space, and so on, In direction of 80° structure fracture produced in Yinzhi age and 30°~60° conjugate fracture produced in Yanshan age also obviously developed in palaeokarsting rocks that bearing secondary pore spaces. Twenty one forms reservoir space, such as pores, solution slit cave and structure fracture had been recognized in well core and casting thin section, include three forms origine pores proceed from depositional (penecontemporaneous)stage, nine forms secondary solutinal pore space procced from poleoweathering crust karsting hyperdiagenesis stage, ive forms secondary pore space procced from buried diagensis stage, and four forms structure fracture and fault. So that often seen several pore spaces appeared in same core or casting thin section. The development degree, distribution range and contributing value for reserivor of each pore space in central gas field are various, lead to the reservoir anisotropic. |
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| Keywords: | Ordos Basin Entral gas field Majiagou Formation Pore space forms Evalution |
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