Sedimentary Characteristics and Models of Sublacustrine Fan in the Skip-shaped Fault Depression of Tongbomiao Formation in Urxun Northern Sub-sag

doi:10.3969/j.issn.1006-6535.2022.02.004

Abstract

Abstract: Urxun Northern Sub-sag in Hailar Basin is a dustpan-shaped fault depression, faulting to the west and overlapping to the east, and the developed steep and gentle slopes control the deposition and reservoir distribution. In order to determine the characteristics of upper high-yield sand body sedimentary reservoirs in Sand Group I (TⅠ) in Tongbomiao Formation and clarify the distribution rules of high-quality sand bodies, a systematic study was conducted on the sedimentary type, sedimentary characteristics and sedimentary model of upper sand body of Oil Group I (TⅠ) in Tongbomiao Formation according to lithofacies, logging facies, seismic facies characteristics, grain size analysis, etc. The results of the study showed that the upper sand body of Tongbomiao TⅠ in the study area was mainly developed with sublacustrine fan deposition, and two sedimentary patterns, namely gravel-rich sublacustrine fan and sand-rich gravel bearing sublacustrine fan, were established through the study of the palaeogeomorphic characteristics, source supply background and triggering mechanism. During the strong tectonic movement in the late period of Tongbomiao Formation, the gravel-rich sublacustrine fan was developed with steep slope and controlled by faulting, while the sand-rich gravel bearing sublacustrine fan was developed with gentle slope and controlled by faulting and gravity. According to the existing exploration evaluation, the gravel-rich sublacustrine fan was considered to be the main target area, and the reservoir accumulation mechanism should be further studied to optimize the targets for the sand-rich gravel bearing sublacustrine fan. The research results have effectively promoted the optimization of favorable reservoirs in the Tongbomiao Formation of Urxun Northern Sub-sag, as well as the deployment of well positions. After further evaluation and optimization of the two types of sublacustrine fans, the available reserve is expected to be 500×10⁴t. There is much for reference of the study results for further oil and gas exploration and development of Tongbomiao Formation.

Key words: sedimentary model, dustpan-shaped fault depression, gravel-rich sublacustrine fan, sand-rich gravel bearing sublacustrine fan, Tongbomiao Formation, Urxun Northern Sub-sag

CLC Number:

TE122.2

Nan Jinhao. Sedimentary Characteristics and Models of Sublacustrine Fan in the Skip-shaped Fault Depression of Tongbomiao Formation in Urxun Northern Sub-sag[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 24-33.

References

[1] WALKER R G.Deep-water sandstone facies and ancient submarine fans:models for exploration for stratigraphic traps[J].AAPG Bulletin,1978,62(6):932-966.
[2] 张庆石,张革,陈彬滔,等.松辽盆地坳陷期湖底扇沉积特征与分布规律——以英台地区青山口组为例[J].天然气地球科学,2014,25(3):318-325.
ZHANG Qingshi,ZHANG Ge,CHEN Bintao,et al.Deposition characteristics and distribution pattern of sublaucustrine fan in Qingshankou Formation,Songliao Basin[J].Natural Gas Geoscience,2014,25(3):318-325.
[3] 李凤杰,李磊,魏旭,等.鄂尔多斯盆地华池地区长₆油层组湖底扇内深水重力流沉积特征[J].古地理学报,2014,16(6):827-834.
LI Fengjie,LI Lei,WEI Xu,et al.Characteristics of deep water gravity flows sediments in sublacustrine fan of the Chang₆ interval of Yanchang Formation in Huachi Area,Ordos Basin[J].Journal of Palaeogeography,2014,16(6):827-834.
[4] 姚威,吴冲龙.二连盆地阿尔凹陷腾一上段湖底扇沉积特征及油气地质意义[J].石油实验地质,2015,37(6):737-741,750.
YAO Wei,WU Chonglong.Sedimentary characteristics and petroleum geology of sublacustrine fan of the upper section of the first member of the Tenggeer Formation in the Aer Sag of the Erlian Basin[J].Petroleum Geology & Experiment,2015,37(6): 737-741, 750.
[5] 徐显生,王建新,杨婷,等.贝尔凹陷南屯组湖底扇特征及有利储集相带[J].新疆石油地质,2010,31(4):361-364.
XU Xiansheng,WANG Jianxin,YANG Ting,et al.Characteristics and favorable reservoir facies belt of sublacutrine fan of Nantun Formation in Beier Sag,Hailar Basin[J].Xinjiang Petroleum Geology,2010,31(4):361-364.
[6] 张辉,曾小明,黄冬梅,等.北部湾盆地涠西南凹陷富砾型和富砂型湖底扇沉积特征差异分析[J].石油实验地质,2017,39(5):633-639.
ZHANG Hui,ZENG Xiaoming,HUANG Dongmei,et al.Differences of sedimentary characteristics of sublacustrine fans between conglomerate-rich and sand-rich types in the Weixinan Sag,Beibu Gulf Basin[J].Petroleum Geology & Experiment,2017, 39(5): 633-639.
[7] 王改卫,黄晓波,代黎明,等.渤海油田富砂性湖底扇沉积模式及有利勘探目标[J].石油地质与工程,2017,31(3):1-4,131.
WANG Gaiwei,HUANG Xiaobo,DAI Liming,et al.Depositional models of sand-rich sublacustrine fan and favorable exploration targets in Bohai Oilfield[J].Petroleum Geology & Engineering,2017,31(3):1-4,131.
[8] 严恒,王丽君,方小宇,等.涠西南凹陷南部斜坡带中段流一段湖底扇沉积特征研究及油气勘探[J].复杂油气藏,2015,8(4):7-12,18.
YAN Heng,WANG Lijun,FANG Xiaoyu,et al.Sedimentary characteristics of sublacustrine fan in the first member of Liushagang Formation in middle section of southern slope in Weixinan Sag[J].Complex Oil and Gas Reservoirs,2015,8(4):7-12,18.
[9] READING H G,RICHARDS M.Turbidite systems in deep-water basin margins classified by grain size and feeder system[J].AAPG Bulletin,1994,78(5):792-822.
[10] 姜在兴.沉积学[M].北京:石油工业出版社,2003:365-368.
JIANG Zaixing. Sedimentology[M].Beijing:Petroleum Industry Press,2003:365-368.
[11] 陈欢庆,舒治睿,林春燕,等.粒度分析在砾岩储层沉积环境研究中的应用——以准噶尔盆地西北缘某区克下组冲积扇储层为例[J].西安石油大学学报(自然科学版),2014,29(6):6-12,34.
CHEN Huanqing,SHU Zhirui,LIN Chunyan,et al.Application of grain-size analysis in research of sedimentary environment of conglomerate reservoir:taking alluvial fan reservoir in the lower member of Karamay Formation in some area of the northwestern margin of Junggar Basin as an example[J].Journal of Xi′an Shiyou University(Natural Science),2014,29(6):6-12,34.
[12] 秦雁群,万仑坤,计智锋,等.深水块体搬运沉积体系研究进展[J].石油与天然气地质,2018,39(1):140-152.
QIN Yanqun,WAN Lunkun,JI Zhifeng,et al.Progress of research on deep-water mass-transport deposits[J].Oil & Gas Geology,2018,39(1):140-152.
[13] 李青松,张世奇,程浩,等.陆相箕状断陷湖盆沉积差异性研究——以冀中富油凹陷为例[J].科学技术与工程,2015,15(17):34-41.
LI Qingsong,ZHANG Shiqi,CHENG Hao,et al. Study on sedimentary difference of the continental fault lacustrine basin:taking Jizhong oil-rich depression as an example[J]. Science Technology and Engineering,2015,15 (17):34-41.
[14] 宋国奇,郝雪峰,刘克奇,等.箕状断陷盆地形成机制、沉积体系与成藏规律——以济阳坳陷为例[J].石油与天然气地质,2014,35(3):303-310.
SONG Guoqi,HAO Xuefeng,LIU Keqi,et al.Tectonic evolution,sedimentary system and petroleum distribution patterns in dustpan-shaped rift basin:a case study from Jiyang Sag,Bohai Bay Basin[J].Oil & Gas Geology,2014,35(3):303-310.
[15] 夏青松,田景春.鄂尔多斯盆地西南部上三叠统长₆油层组湖底扇特征[J].古地理学报,2007,9(1):33-43.
XIA Qingsong,TIAN Jingchun.Sedimentary characteristics of sublacustrine fan of the interval of Chang₆ Formation of Upper Triassic in southwestern Ordos Basin[J].Journal of Palaeogeography,2007,9(1):33-43.
[16] 陈广坡,王天奇,李林波,等.箕状断陷湖盆湖底扇特征及油气勘探——以二连盆地赛汉塔拉凹陷腾格尔组二段为例[J].石油勘探与开发,2010,37(1):63-69.
CHEN Guangpo,WANG Tianqi,LI Linbo,et al.Characteristics of sublacustrine fan in half-graben rift lake basin and its petroleum prospecting:case study on the second member of Tenggeer Formation,Saihan Tal Sag,Erlian Basin[J].Petroleum Exploration and Development ,2010,37(1):63-69.
[17] 崔周旗,李文厚,吴健平,等.乌里雅斯太凹陷斜坡带湖底扇相砾岩体沉积特征与隐蔽油藏勘探[J].沉积学报,2005,23(1):21-28.
CUI Zhouqi,LI Wenhou,WU Jianping,et al.The depositional characteristics of conglomerate bodies and exploration in subtle oil pools of sublacustrine fan facies in Slope Zone,Uliastai Sag[J].Acta Sedimentologica Sinica,2005,23(1):21-28.