鄂尔多斯盆地马岭地区长8段油藏主控因素
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摘要
探讨鄂尔多斯盆地马岭地区上三叠统延长组第8段石油富集的主要控制因素。通过大量的钻探、分析化验资料,对长81和长82亚段的沉积、储层、油藏特征进行了对比研究。结果表明长7段烃源岩控制了长8段油藏的分布范围;烃源岩在主要生烃期形成的过剩压力为石油运移到长8段储集层的主要动力;长81油藏富集于水下分流河道微相和长石溶蚀成岩作用形成的相对高渗砂体,长82油藏主要分布于滩坝微相和绿泥石膜胶结作用形成的相对高渗储集层。近源和优势砂体的有效组合是长81油藏大面积分布的主控因素,裂缝和相对高渗砂体配置是长82油藏富集的关键。针对该区长8油藏的勘探思路是:自东向西推进,长81亚段追踪优势砂体,长82亚段寻找高渗砂带。
The Member 8 of Upper Triassic Yanchang Formation(Chang 8)reservoir is divided into two sections of Chang 81 and Chang 82 in Maling area,Ordos Basin.Based on the data of drilling cores and experiments,the characteristics of deposition,reservoir and oil accumulation of the Chang 81 and Chang 82 are studied through the comparative analyses,so as to determine the control factors of oil accumulation of Chang 8 reservoir in Maling area.It shows that the distribution range of Chang 8 reservoir is controlled by Chang 7 hydrocarbon source rocks.The excess pressure generated by Chang7 hydrocarbon source rocks in the main hydrocarbon generation period was the main driving force for the oil migration to Chang 8 reservoir.The Chang 81 reservoir is accumulated in the relatively high permeability sand body formed by the underwater distributary channel microfacies and feldspardissolution,while the Chang 82 reservoir is mainly located in the relatively high permeability sandstone formed by beach bar microfacies and chlorite cementation.The main control factor of widespread distribution of Chang 81 reservoir is the effective combination of favorable sandstones and proximal sources,while the combination of cracks and relatively high permeability sandstone is very important for the accumulation of Chang 82 reservoir.It is suggested that the strategy of Chang 8 reservoir exploration is working from the east to west area,meanwhile tracking favorable sand body in Chang 81 section and looking for high permeability sandstones in Chang 82 section.
The Member 8 of Upper Triassic Yanchang Formation(Chang 8)reservoir is divided into two sections of Chang 81 and Chang 82 in Maling area,Ordos Basin.Based on the data of drilling cores and experiments,the characteristics of deposition,reservoir and oil accumulation of the Chang 81 and Chang 82 are studied through the comparative analyses,so as to determine the control factors of oil accumulation of Chang 8 reservoir in Maling area.It shows that the distribution range of Chang 8 reservoir is controlled by Chang 7 hydrocarbon source rocks.The excess pressure generated by Chang7 hydrocarbon source rocks in the main hydrocarbon generation period was the main driving force for the oil migration to Chang 8 reservoir.The Chang 81 reservoir is accumulated in the relatively high permeability sand body formed by the underwater distributary channel microfacies and feldspardissolution,while the Chang 82 reservoir is mainly located in the relatively high permeability sandstone formed by beach bar microfacies and chlorite cementation.The main control factor of widespread distribution of Chang 81 reservoir is the effective combination of favorable sandstones and proximal sources,while the combination of cracks and relatively high permeability sandstone is very important for the accumulation of Chang 82 reservoir.It is suggested that the strategy of Chang 8 reservoir exploration is working from the east to west area,meanwhile tracking favorable sand body in Chang 81 section and looking for high permeability sandstones in Chang 82 section.
引文
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[17]杨华,傅强,付金华.鄂尔多斯晚三叠世盆地沉积层序与油气成藏[M].北京:地质出版社,2007:152-153.Yang H,Fu Q,Fu J H.Sedimentary Sequence and Hydrocarbon Accumulation of Late Triassic,Ordos Basin[M].Beijing:Geological Publishing House,2007:152-153.(in Chinese)
[2]叶博,梁晓伟,牛小兵,等.鄂尔多斯盆地华庆地区三叠系长9砂岩成岩相研究[J].西安科技大学学报,2013,33(3):298-304.Ye B,Liang X W,Niu X B,et al.Diagenetic facies of Chang 9sandstone of Triassic in Huaqing area of Ordos Basin[J].Journal of Xian University of Science and Technology,2013,33(3):298-304.(in Chinese)
[3]罗静兰,李忠兴,史成恩,等.鄂尔多斯盆地西南部上三叠统延长组长8、长6油层组的沉积体系与物源方向[J].地质通报,2008,27(1):101-111.Luo J L,Li Z X,Shi C E,et al.Depositional systems and provenance directions for the Chang 6and Chang 8reservoir groups of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin,China[J].Geological Bulletin of China,2008,27(1):101-111.(in Chinese)
[4]李文厚,庞军刚,曹红霞,等.鄂尔多斯盆地晚三叠世延长期沉积体系及岩相古地理演化[J].西北大学学报(自然科学版),2009,29(3):501-506.Li W H,Pang J G,Cao H X,et al.Depositional system and paleogeographic evolution of the late Triassic Yanchang Stage in Ordos Basin[J].Journal of Northwest University(Natural Science Edition),2009,29(3):501-506.(in Chinese)
[5]楚美娟,郭正权,白嫦娥.鄂尔多斯盆地延长组长8油层组沉积及其演化特征[J].石油天然气学报,2012,34(2):13-18.Chu M J,Guo Z Q,Bai C E.Sedimentation and evolution in Chang 8reservoir of Yanchang Formation in Ordos Basin[J].Journal of Oil and Gas Technology,2012,34(2):13-18.(in Chinese)
[6]杨华,刘自亮,朱筱敏,等.鄂尔多斯盆地西南缘上三叠统延长组物源与沉积体系特征[J].地学前缘,2013,20(2):10-17.Yang H,Liu Z L,Zhu X M,et al.Provenance and deposition systems of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin,China[J].Earth Science Frontiers,2013,20(2):10-17.(in Chinese)
[7]张霞,林春明,陈召佑.鄂尔多斯盆地镇泾区块上三叠统延长组砂岩中绿泥石矿物特征[J].地质学报,2011,85(10):1659-1669.Zhang X,Lin C M,Chen Z Y.Characteristics of chlorite minerals from Upper Triassic Yanchang Formation in the Zhenjing Area,Ordos Basin[J].Acta Geologica Sinica,2011,85(10):1659-1669.(in Chinese)
[8]高淑梅,陈娟,胡剑,等.鄂尔多斯盆地马岭油田延长组长8储层特征及影响因素分析[J].特种油气藏,2013,20(2):34-37.Gao S M,Chen J,Hu J,et al.Characteristics and influence factor analysis of the Chang 8reservoir in Yanchang Formation of Maling oilfield,Ordos Basin[J].Special Oil and Gas Reservoirs,2013,20(2):34-37.(in Chinese)
[9]李士祥,楚美娟,黄锦绣,等.鄂尔多斯盆地延长组长8油层组砂体结构特征及成因机理[J].石油学报,2013,34(3):435-443.Li S X,Chu M J,Huang J X,et al.Characteristics and genetic mechanism of sandbody architecture in Chang-8oil layer of Yanchang Formation,Ordos Basin[J].Acta Petrolei Sinica,2013,34(3):435-443.(in Chinese)
[10]刘化清,李相博,完颜容,等.鄂尔多斯盆地长8油层组古地理环境与沉积特征[J].沉积学报,2011,29(6):1086-1095.Liu H Q,Li X B,Wanyan R,et al.Palaeogeographic and sedimentological characteristics of the Triassic Chang 8,Ordos Basin,China[J].Acta Sedimentologica Sinica,2011,29(6):1086-1095.(in Chinese)
[11]朱筱敏,邓秀芹,刘自亮,等.大型拗陷湖盆浅水辫状河三角洲沉积特征及模式:以鄂尔多斯盆地陇东地区延长组为例[J].地学前缘,2013,20(2):20-28.Zhu X M,Deng X Q,Liu Z L,et al.Sedimentary characteristics and model of shallow braided delta in large-scale lacustrine:An example from Triassic Yanchang Formation in Ordos Basin[J].Earth Science Frontiers,2013,20(2):20-28.(in Chinese)
[12]朱筱敏,潘荣,赵东娜,等.湖盆浅水三角洲形成发育与实例分析[J].中国石油大学学报(自然科学版),2013,37(5):7-12.Zhu X M,Pan R,Zhao D N,et al.Formation and development of shallow-water deltas in lacustrine basin and typical case analyses[J].Journal of China University of Petroleum(Natural Science Edition),2013,37(5):7-12.(in Chinese)
[13]杨华,张文正.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:地质地球化学特征[J].地球化学,2005,34(2):147-154.Yang H,Zhang W Z.Leading effect of the seventh member high-quality source rock of Yanchang Formation in Ordos Basin during the enrichment of lowpenetrating oil-gas accumulation:Geology and geochemistry[J].Geochimica,2005,34(2):147-154.(in Chinese)
[14]张克银.鄂尔多斯盆地南部中生界成藏动力学系统分析[J].地质力学学报,2005,2(1):25-32.Zhang K Y.Analysis of the Mesozoic accumulationforming dynamic system in the southern Ordos Basin[J].Journal of Geomechanics,2005,2(1):25-32.(in Chinese)
[15]席胜利,刘新社,王涛.鄂尔多斯盆地中生界油气运移特征分析[J].石油实验地质,2004,26(3):229-235.Xi S L,Liu X S,Wang T.Analysis on the migration characteristics of the Mesozoic petroleum in the Ordos Basin[J].Petroleum Geology&Experiment,2004,26(3):229-235.(in Chinese)
[16]刘显阳,惠潇,李士祥.鄂尔多斯盆地中生界低渗透岩性油藏形成规律综述[J].沉积学报,2012,30(5):964-974.Liu X Y,Hui X,Li S X.Summary of formation rule for low permeability lithologic reservoir of Mesozoic in Ordos Basin[J].Acta Sedimentologica Sinica,2012,30(5):964-974.(in Chinese)
[17]杨华,傅强,付金华.鄂尔多斯晚三叠世盆地沉积层序与油气成藏[M].北京:地质出版社,2007:152-153.Yang H,Fu Q,Fu J H.Sedimentary Sequence and Hydrocarbon Accumulation of Late Triassic,Ordos Basin[M].Beijing:Geological Publishing House,2007:152-153.(in Chinese)