鄂尔多斯盆地东部奥陶系盐下储层预测
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摘要
鄂尔多斯盆地奥陶系的膏盐岩沉积面积达5×104km2,天然气的勘探程度很低。为此,利用测井技术和地震反演技术对盐下储层进行了预测。首先,通过对盐下沉积特征的综合分析,对盐下储集层段的发育层位和主要储集岩类型进行了描述;然后,采用ELAN测井技术对盐下储层的物性进行了分析,认为盐下储层的物性在普遍较差的背景上存在相对发育的层段和区带;最后,利用全局优化多道地震反演技术,对岩下储层进行了预测,认为盐下存在的局部隆起是圈闭和储层发育的有利区带。
Now, the exploration for natural gas in Ordovician system mainly concentrates on the top of weathered crust. So to find the new strata to carry out the exploration for natural gas is the key to enlarge the exploration area and increase the reserve. Through analyzing the evolution of Ordovician sedimentary facies, it is found that Ma1, Ma3, Ma5 member of Majiagou stage, Ordovician, is the prosperous period for evaporite deposition, with the area of gypsum/salt rock being 5×104 km2 and the gypsum/salt lake sediment and tidal flat sediment alternatively appearing in the vertical sequence, making the dolomite and gypsum/salt rock be interlay-ered, which laid a good foundation for forming the under-salt hydrocarbon reservoir. The result of core analysis as well as logging analysis shows that there still exist some well-developed zones on a background of poor under-salt reservoir property. Based on the characteristic of easy flowing and deforming of the salt rock, the seismic inversion technique is used to forecast those zones favorable for forming the upheaval and fault structure, providing guidance for natural gas exploration in under-salt reservoir.
Now, the exploration for natural gas in Ordovician system mainly concentrates on the top of weathered crust. So to find the new strata to carry out the exploration for natural gas is the key to enlarge the exploration area and increase the reserve. Through analyzing the evolution of Ordovician sedimentary facies, it is found that Ma1, Ma3, Ma5 member of Majiagou stage, Ordovician, is the prosperous period for evaporite deposition, with the area of gypsum/salt rock being 5×104 km2 and the gypsum/salt lake sediment and tidal flat sediment alternatively appearing in the vertical sequence, making the dolomite and gypsum/salt rock be interlay-ered, which laid a good foundation for forming the under-salt hydrocarbon reservoir. The result of core analysis as well as logging analysis shows that there still exist some well-developed zones on a background of poor under-salt reservoir property. Based on the characteristic of easy flowing and deforming of the salt rock, the seismic inversion technique is used to forecast those zones favorable for forming the upheaval and fault structure, providing guidance for natural gas exploration in under-salt reservoir.
引文
1郑聪斌,冀小林,贾疏源．陕甘宁盆地中部奥陶系风化壳古岩溶发育特征[J]．中国岩溶,1995,14(3):280-288
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5刘洛夫,朱毅秀,胡爱梅．滨里海盆地盐下层系的油气地质特征[J]．西南石油学院学报,2002,24(3):11-16
6赵重远．鄂尔多斯盆地演化及中央古隆起形成机制和含油气有利区[M]．陕西西安:西北大学出版社,1990．93-102
7付金华,郑聪斌．鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征[J]．古地理学报,2001,22(4): 34-38
8李莉,吴慕宁,李大荣．加蓬含盐盆地及邻区油气勘探现状和前景[J]．中国石油勘探,2005,10(3):57-68
9钱桂华．哈萨克斯坦滨里海盆地油气地质特征及勘探方向[J]．中国石油勘探,2005,10(5):60-66
10 Leite J,Costa D. Lower Congo Basin, deep water exploration province, offshore west Africa [J] . AAPG memoir 74,2001,517-530
11贾承造,赵文智,魏国齐等．盐构造与油气勘探[J]．石油勘探与开发,2003,30(17):17-19
12刘晓峰,解习农．与盐构造相关的流体流动和油气运聚[J]．地学前缘,2001,8(4):343-349
13漆立新．塔河油田碳酸盐岩储层高精度地震勘探的思考[J]．石油物探,2005,44(4):352-356
14周玉冰,董桥梁,张玉斌．多参数多信息储层预测中岩性特征及层位标定技术研究[J]．石油地球物理勘探, 2003,38(1):53-57
2郑聪斌,王飞雁,贾疏源．陕甘宁盆地中部奥陶系风化壳岩溶岩及岩溶相模式[J]．中国岩溶,1997,16(4): 351-361
3何自新,郑聪斌,陈安宁等．长庆气田奥陶系古沟槽展布及其对气藏的控制[J]．石油学报,2001,22(4): 34-38
4何自新,郑聪斌,王彩丽等．鄂尔多斯盆地靖边气田的发现与勘探开发[J]．海相油气地质,2005,10(2):37-44
5刘洛夫,朱毅秀,胡爱梅．滨里海盆地盐下层系的油气地质特征[J]．西南石油学院学报,2002,24(3):11-16
6赵重远．鄂尔多斯盆地演化及中央古隆起形成机制和含油气有利区[M]．陕西西安:西北大学出版社,1990．93-102
7付金华,郑聪斌．鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征[J]．古地理学报,2001,22(4): 34-38
8李莉,吴慕宁,李大荣．加蓬含盐盆地及邻区油气勘探现状和前景[J]．中国石油勘探,2005,10(3):57-68
9钱桂华．哈萨克斯坦滨里海盆地油气地质特征及勘探方向[J]．中国石油勘探,2005,10(5):60-66
10 Leite J,Costa D. Lower Congo Basin, deep water exploration province, offshore west Africa [J] . AAPG memoir 74,2001,517-530
11贾承造,赵文智,魏国齐等．盐构造与油气勘探[J]．石油勘探与开发,2003,30(17):17-19
12刘晓峰,解习农．与盐构造相关的流体流动和油气运聚[J]．地学前缘,2001,8(4):343-349
13漆立新．塔河油田碳酸盐岩储层高精度地震勘探的思考[J]．石油物探,2005,44(4):352-356
14周玉冰,董桥梁,张玉斌．多参数多信息储层预测中岩性特征及层位标定技术研究[J]．石油地球物理勘探, 2003,38(1):53-57
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