川西坳陷雷口坡组气藏勘探远景区预测
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摘要
川西坳陷中三叠统雷口坡组顶面是一个风化面,目前在雷口坡组还没有发现大型的溶蚀孔洞缝型气藏。从雷口坡组的成藏地质条件、岩相古地理演化、沉积相和地震相等方面探讨了雷口坡组发育优质储层的可能性,预测了洛带气田、新场气田和马井构造雷口坡组气藏的勘探远景区。雷口坡组优质储层发育的基础是潮坪沉积相的藻屑滩和古岩溶形成的各类溶蚀性孔隙,区域岩相古地理分析认为,沿着中坝—安县—新场—洛带印支期古斜坡环带可能发育藻屑滩,且受到过暴露剥蚀作用。洛带地区雷口坡组地震相表现为丘形反射,两侧存在斜交反射带,顶部呈削蚀面特征,可能存在溶蚀沟和古潜山,预测发育有经过暴露溶蚀作用的藻屑滩;新场气田雷口坡组顶部存在地层圈闭和斜交反射带,有明显的削蚀面特征;马井构造存在连片的丘形地震异常。结合露头剖面的藻屑滩特征,分析认为洛带气田和新场气田的雷口坡组为有利勘探远景区,马井构造雷口坡组为远景勘探区。
The top of Leikoupo formation at middle Triassic (T2l) in Western Sichuan Depression is an erosional surface. At present,gas reservoir with large scale caverns and corroded fissures has not been found in T2l. Aiming at this problem, through analyzing the geological conditions of reservoir formation, lithofacies paleogeo graphic evolvement, sedimentary facies and seismic facies, etc. we discussed the possibility of developing favorable reservoirs, and predieted the exploration potential area in Luodai gasfield, Xinchang gasfield and Maiing gasfield. The algae elastic beach deposited in the tidal flat and corrosion pore caused by ancient karst are the bases of favorable reservoir of T2l. by analyzing regional lithofacies palaeogeography,we found that algae elastic beaches might develop and be exposure to erosion in lndosinian paleo-slope annulus along Zhongba,Anxian,Xinchang and Luodai gasfield. The seismic facies of T2l in Luodai field is mound configuration;oblique reflections exist in both side,and the top is truncation. All this phenomena indicates that there may be corrosion ditch, buried hill and algae corroded elastic beaches. There exist stratigraphic traps and oblique reflection on the superface of T2I in Xinchang gasfield, which sbows obvious truncation characteristic. There also exist mound seismic a nomalies in Majing gasfield. According to all these data, combined with algae elastic beaches on outcrop section,T2l of Luodai gasfield and Xinchang gasfield is taken as favorable exploration area, and T2l of Majing gasfield is taken as the exploration potential area in next step.
The top of Leikoupo formation at middle Triassic (T2l) in Western Sichuan Depression is an erosional surface. At present,gas reservoir with large scale caverns and corroded fissures has not been found in T2l. Aiming at this problem, through analyzing the geological conditions of reservoir formation, lithofacies paleogeo graphic evolvement, sedimentary facies and seismic facies, etc. we discussed the possibility of developing favorable reservoirs, and predieted the exploration potential area in Luodai gasfield, Xinchang gasfield and Maiing gasfield. The algae elastic beach deposited in the tidal flat and corrosion pore caused by ancient karst are the bases of favorable reservoir of T2l. by analyzing regional lithofacies palaeogeography,we found that algae elastic beaches might develop and be exposure to erosion in lndosinian paleo-slope annulus along Zhongba,Anxian,Xinchang and Luodai gasfield. The seismic facies of T2l in Luodai field is mound configuration;oblique reflections exist in both side,and the top is truncation. All this phenomena indicates that there may be corrosion ditch, buried hill and algae corroded elastic beaches. There exist stratigraphic traps and oblique reflection on the superface of T2I in Xinchang gasfield, which sbows obvious truncation characteristic. There also exist mound seismic a nomalies in Majing gasfield. According to all these data, combined with algae elastic beaches on outcrop section,T2l of Luodai gasfield and Xinchang gasfield is taken as favorable exploration area, and T2l of Majing gasfield is taken as the exploration potential area in next step.
引文
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2陶洪兴,张荫本,唐泽荛.中国油气储层研究图集(卷二)碳酸盐岩[M].北京:石油工业出版社,1994.111- 128
3华北石油勘探开发设计研究院.华北碳酸盐岩古潜山油藏开发[M].北京:石油工业出版社,1985.1-83
4蔡瑞.碳酸盐岩地层反射结构分析与储层预测[J].石油物探,2006,45(1):57-61
5陈广坡,潘建国,陶云光.碳酸盐岩岩溶型储层综合预测评价技术的应用及效果分析[J].石油物探,2005,44 (1):33-36
6李明,李守林,赵一民.塔里木盆地某地区碳酸盐岩裂缝储层预测研究[J].石油物探,2000,39(2):24-35
7李宗杰,王胜泉.地震属性参数在塔河油田储层含油气性预测中的应用[J].石油物探,2004,43(5):453- 457
8杨子川,李宗杰,窦慧媛.储层的地震识别模式分析及定量预测技术初探[J].石油物探,2007,46(4):370- 377
9朱仕军,黄继祥,李先荣,等.川中—川南过渡带古残丘的地震解释及其对香溪群油气藏的控制作用[J].西南石油学院学报,1994,16(4):7-10
10何鲤,廖光伦,戚斌,等.中坝气田雷三气藏分析及有利相带预测[J].天然气勘探与开发,2002,25(4):20-26
11四川油气区石油地质编写组.中国石油志—四川油气区[M].北京:石油工业出版社,1989.424-432,82- 85
12郭正吾,邓康龄,韩永辉.四川盆地形成与演化[M].北京:地质出版社,1994.1-190
13李知维,沈昭国,侯方浩,等.四川盆地川中—川南过渡带中三叠统雷口坡组雷一~1亚段储集层特征及发育环境[J].内蒙古石油化工,2006(6):90-93
14罗启后,王世谦.四川盆地中西部三叠系重点含气层系天然气富集条件研究[J].天然气工业,1996,16(增刊):40-54
15刘宝珺,许效松.中国南方岩相古地理图集[M].科学出版社,1994.155-188
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