【作者】 王鹏；

【导师】 张小莉；

【作者基本信息】 西北大学 ， 岩石学、矿物学、矿床学， 2006， 硕士

【摘要】 本文为了在鄂尔多斯西缘上古生界低孔低渗储层的背景下预测相对高孔高渗储层，采用地质资料与测井评价相结合，对相对高孔隙带和裂缝发育带进行评价，分析了不同地区的它们的成因联系，进一步优选了有利高效储层。获得的主要研究成果和认识为： 1、上古生界石炭系羊虎沟组砂体以潮坪、泻湖沉积为主；太原组砂体南部为障壁岛沉积，北部为三角洲沉积。二叠系山西组、石盒子组和石千峰组砂体主要为河流、三角洲沉积。 2、贺兰山—横山堡地区处于逆冲带上，距物源近，成岩阶段早，压实作用弱，下石盒子至山西组高孔隙带普遍发育，而上石盒子组，仅在胜利井、图东断块半背斜和色东构造带上发育高孔隙带；天环坳陷带北部鄂托克前旗地区，离物源较近，物源充足，加之成岩作用阶段较早，有利于次生孔隙发育，下石盒子组和山西组高孔隙带发育；马家滩—惠安堡地区，芦参1井山西组主要处于逆冲带下盘，由于构造抬升造成地层承受压力得到释放而减小，压实作用减小，同时酸性地层水环境下，凝灰质填隙物不稳定性导致产生溶蚀粒间孔和高岭石晶间孔，因此芦参1井在山西组砂体中发育高孔隙带；平凉—沙井子地区，埋藏深度大，砂岩储层压实压溶作用强烈，原生粒间孔隙度少，成岩作用阶段晚，次生孔隙发育不明显，仅在镇探1井盒6和山1底部具相对高孔隙带。 3、综合分析，研究区构造显裂缝主要发育在北部贺兰山—横山堡地区和鄂托克前旗地区；而构造微裂隙主要发育在中部和南部。 4、最有利高效储层位于贺兰山—横山堡地区的下石盒子组至山西组以及胜利井、图东断块半背斜和色东构造带上的上石盒子组；较有利高效储层主要为鄂托克前旗以北地区的下石盒子组和山西组，以及位于冲断带下盘与芦参1井山西组沉积、成岩作用特征类似的储层；潜力高效储层为平凉—沙井子地区下石盒子组及山1段储层。更多还原

【Abstract】 In order to predicted the relative high porosity and relative high permeability reservoirs on the background of low porosity and low permeability reservoirs of Upper Paleozoic in the western of Ordors Basin, The thesis evaluated the distribution of the relative high pore zone and the fracture zone and analyzed their genesis relationships of different region, and further selected the high-efficient reservoirs.The results in the thesis are as follows:1. The sandstone body of Yanghugou formation deposited mostly from tidal flat and lagoon. In Taiyuan formation, the southern sandstone body deposited from barrier islands, the northern sandstone body deposited from delta. In Shanxi formation, Shihezi formation and Shiqianfeng formation, the sandstone body deposited mainly from fluvial and delta deposition.2. The Helan Mountains-Hengshanbao region located at the obduction zone .The region is nearby the main formation source, earlier diagenesis phases and weak compacting action. The higher porosity reservoir belts distributed generally in Lower Shihezi formation and Shanxi formation. However, the higher porosity reservoir belts in Upper Shihezi formation only distributed in the Shenglijing tectonic zone, the Tudong fault block and the Sedong tectonic zone. The Etuokeqianqi region is within nearer distance of the main formation source, enough sediment supply. They are of great advantage to the development of secondary porosity. The higher porosity reservoir belts distributed in Lower Shihezi formation and Shanxi formation in this region. Well Lucan 1 located at the dropped side of obduction zone in the Majiatan-Huianbao region. Owing to structure uplift resulted in stratum pressure decreased, it is weak compacting action. Under the control of acidic diagenetic environment, the instability of volcanic tuff filling resulted in the development of intergranular dissolution porosity and intercrystal porosity with Kaolinite filling. The higher porosity reservoir belts developed in Shanxi formation in Well Lucan 1. The diagenesis phases of Pingliang-Shajingzi region are later. Only the higher porosity reservoir belts developed in He 6 member and Shan 1 member in Well Zhentan 1.3. The obvious fracture developed mainly in the Helan Mountains- Hengshanbao region and the Etuokeqianqi region, the northern of the western of Ordors Basin. The minor fracture developed mainly in the central and southern of the western of Ordors更多还原