准噶尔盆地石南地区清水河组一段层序地层特征
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摘要
清水河组一段是石南31井区岩性油藏、石南44井区微幅构造油藏及整个腹部地区的重要产层,探究其层序地层特征对于指导研究区及整个腹部地区清水河组一段的隐蔽油气藏勘探有重要意义。通过对岩心、测井、地震等资料综合分析,指出清水河组一段相当于下白垩统第一个三级层序的低位及湖侵体系域。其层序地层特征显著,表现为:低位体系域以沟谷残余可容纳空间充填沉积为特点,分布较为局限,沟谷主要沉积辫状河道砂砾岩;湖侵体系域以退积型三角洲和三角洲前缘滑塌浊积扇沉积为主。建立了石南31井区的成藏模式,并指出三南凹陷中西部是岩性—地层油气藏勘探的有利区带。沟谷砂砾岩及三角洲前缘滑塌浊积扇可形成岩性圈闭,退积型三角洲可形成地层超覆圈闭;湖侵体系域顶部的泥岩可做为区域盖层;斜坡古地貌、深大断裂—中浅层断裂系统与不整合匹配为有效的输导体系。
The first member of Qingshuihe Formation is a major pay formation of the lithologic oil reservoir in Well Shinan 31 area,of the low-amplitude structural oil reservoir in Well 44 Shinan area,and of the whole hinterland region in Junggar Basin.Researching its sequence stratigraphic characteristics is significant for the prospecting on subtle reservoir in Shinan area,even in the whole hinterland region.Based on the comprehensive analysis of cores,logs and seismic data,this paper points out that the first member of Qingshuihe Formation corresponds with the sediments of the lowstand and transgressive systems tracts of the first third class sequence in Lower Cretaceous.The sequence stratigraphy is characterized by as follows:the lowstand systems tracts,distributing limited,is consisted of the remained accommodation sediments in trench and valley,which deposited mainly pebbly sandstone of braided channel;the transgressive systems tracts develops retrograding delta and delta front slumping turbidity fan.The paper sets up a model for the hydrocarbon reservoir forming in Well Shinan 31 area and concludes that the middle-western part of Sannan depression is the favorable prospecting region for the type of stratigraphic-lithologic reservoir.Regionally,the stratigraphic traps make up of the channel pebbly sandstone and the slumping turbidite fan occurred in deltafront,and,the lithologic traps make up of the retrograding delta;the mudstone on the top of the transgressive systems tracts can be regarded as the seal;The effective passage system is matched up with the slope palaeotopography,the discordogenic fault,middle-shallow fault system,and the unconformity.
The first member of Qingshuihe Formation is a major pay formation of the lithologic oil reservoir in Well Shinan 31 area,of the low-amplitude structural oil reservoir in Well 44 Shinan area,and of the whole hinterland region in Junggar Basin.Researching its sequence stratigraphic characteristics is significant for the prospecting on subtle reservoir in Shinan area,even in the whole hinterland region.Based on the comprehensive analysis of cores,logs and seismic data,this paper points out that the first member of Qingshuihe Formation corresponds with the sediments of the lowstand and transgressive systems tracts of the first third class sequence in Lower Cretaceous.The sequence stratigraphy is characterized by as follows:the lowstand systems tracts,distributing limited,is consisted of the remained accommodation sediments in trench and valley,which deposited mainly pebbly sandstone of braided channel;the transgressive systems tracts develops retrograding delta and delta front slumping turbidity fan.The paper sets up a model for the hydrocarbon reservoir forming in Well Shinan 31 area and concludes that the middle-western part of Sannan depression is the favorable prospecting region for the type of stratigraphic-lithologic reservoir.Regionally,the stratigraphic traps make up of the channel pebbly sandstone and the slumping turbidite fan occurred in deltafront,and,the lithologic traps make up of the retrograding delta;the mudstone on the top of the transgressive systems tracts can be regarded as the seal;The effective passage system is matched up with the slope palaeotopography,the discordogenic fault,middle-shallow fault system,and the unconformity.
引文
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11于兴河.碎屑岩系油气储层沉积学.北京:石油工业出版社,2002[Yu Xing-he.Reservoir Sedimentology of Continental Clastic Rocks in China.Beijing:Petroleum Industry Press.2002]
12曹剑,胡文暄,张义杰,等.准噶尔盆地油气沿不整合运移的主控因素分析.沉积学报,2006,24(3):398-406[Cao Jian,Hu Wenxu-an,Zhang Yijie,et al.The main factor controlling petroleum migra-tion along unconfomity in the Junggar Basin.Acta Sedimentogica Sini-ca,2006,24(3):398-406]
13吴金才,孟闲龙,王离迟,等.准噶尔盆地腹部隐蔽油气藏及勘探思路.石油与天然气地质,2004,25(6):682-685[Wu Jincai,Meng Xianlong,Wang Lichi,et al.Characteristics of subtle oil/gas reser-voirs and exploration strategy in central Junggar Basin.Oil and Gas Geology,2004,25(6):682-685]
2沈守文,彭大钧,颜其彬,等.试论隐蔽油气藏的分类及勘探思路.石油学报,2000,21(1):16-22[Shen Showwen,Peng Dajun,Yan Qibin,et al.Classification and exploration methods of Suble trap reser-voirs.Acta Petrolei Sinica,2000,21(1):16-22]
3鲍志东,刘凌,张冬玲,等.准噶尔盆地侏罗系沉积体系纲要.沉积学报,2005,23(2):194-202[Bao Zhidong,Liu Ling,Zhang Dongling,et al.Depositional system frameworks of the Jurassic in Junggar Basin.Acta Sedimentologica Sinica,2005,23(2):194-202]
4胡平,徐恒,李新兵,等,准噶尔盆地东部侏罗纪含煤岩系沉积环境及基准面旋回划分.沉积学报,2006,24(3):377-386[Hu Ping,Xu Heng,Li Xinbing,et al.Sedimentary environments and the strati-graphic base-level cycle division of Jurassic Coa1Measures in the East of Junggar Basin.Acta Sedimentogica Sinica,2006,24(3):377-386]
5鲍志东,管守锐,李儒峰,等.准噶尔盆地侏罗系层序地层学研究.石油勘探与开发,2002,29(1):48-51[Bao Zhidong,Guan Shouri,Li Rufeng,et al.Sequence stratigraphy of the Jurassic in Junggar Basin.Petroleum Exploration and Development,2002,29(1):48-51]
6王宜林,王英民,齐雪峰,等.准噶尔盆地侏罗系层序地层划分.新疆石油地质,2001,22(5):382-385[Wang Yilin,Wang Yingmin,Qi Xuefeng,et al.Classification of stratigraphic sequences of Jurassic in Junggar Basin.Xinjiang Petroleum Geology,2001,22(5):382-385]
7张立强,罗晓容,何登发,等.准噶尔盆地南缘下白垩统层序界面的识别.沉积学报,2004,22(4):636-643[Zhang Liqian,Luo Xi-aorong,He Dengfa,et al.Sequence boundaries of the Lower Creta-ceous,Southern Junggar Basin.Acta Sedimentogica Sinica,2004,22(4):636-643]
8朱爱国,帕尔哈提,王川燕.准噶尔盆地东部北三台地区白垩系地层沉积特征.新疆石油学院学报,2001,13(1):1-6[Zhu Aiguo,Par-hati,Wang Chuanyan.Sedimentary features of the Cretaceous stratum in Beisantai area,Eastern Part of Junggar Basin.Journal of Xinjiang Petroleum Institute,2001,13(1):1-6]
9李德江,杨俊生,朱筱敏.准噶尔盆地层序地层学研究.西安石油大学学报(自然科学版),2005,20(3):60-71[Li Dejiang,Yang Junsh-eng,Zhu Xiaomin.Study on the sequence stratigraphy of Junggarr Ba-sin.Journal of Xi’an Shiyou University(Natural Science Edition),2005,20(3):60-71]
10毕研鹏,田世澄,陈永进.孤北地区古地貌特征及其对油气分布的控制作用.油气地质与采收率,2002,5(9):17-19[Bi Yanpeng,Tian Shicheng,Chen Yongjin.Palaeogeomorphic features and its functions of controlling petroleum distribution in Gubei area.PGRE,2002,9(5):17-19]
11于兴河.碎屑岩系油气储层沉积学.北京:石油工业出版社,2002[Yu Xing-he.Reservoir Sedimentology of Continental Clastic Rocks in China.Beijing:Petroleum Industry Press.2002]
12曹剑,胡文暄,张义杰,等.准噶尔盆地油气沿不整合运移的主控因素分析.沉积学报,2006,24(3):398-406[Cao Jian,Hu Wenxu-an,Zhang Yijie,et al.The main factor controlling petroleum migra-tion along unconfomity in the Junggar Basin.Acta Sedimentogica Sini-ca,2006,24(3):398-406]
13吴金才,孟闲龙,王离迟,等.准噶尔盆地腹部隐蔽油气藏及勘探思路.石油与天然气地质,2004,25(6):682-685[Wu Jincai,Meng Xianlong,Wang Lichi,et al.Characteristics of subtle oil/gas reser-voirs and exploration strategy in central Junggar Basin.Oil and Gas Geology,2004,25(6):682-685]
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