Sedimentary Facies of Member 3 of the Upper Triassic Baijiantan Formation in the Western Slope Area of Mahu Sag and Its Significance for Hydrocarbon Exploration

doi:10.3969/j.issn.1006-6535.2021.03.001

Abstract

Abstract: In order to fill the gap in sedimentology of Baijiantan Formation in the western slope area of Mahu Sag, the sedimentary facies of Member 3 of Baijiantan Formation were studied with core, logging, and analytical and test data. The results showed that the target layer was of the braided river delta facies, two subfacies (delta front and prodelta) and five microfacies (underwater distributary channel, inter-tributary bays, channel mouth bar, distal bar, and prodelta mud) were identified; under the background of shallow-water deposit, there were braided river delta-front lobes developed in two provenance directions in northwest and northeast in the study area; during the period of deposition from T₃b₃⁴ sublayer at the bottom to T₃b₃¹ sublayer at the top, the front lobe continued to accumulate towards the center of the lake basin; during the deposition period of T₃b₃² and T₃b₃¹ sublayers, underwater distributary channel and underwater distributary channel were widely distributed in the study area and could be used as the primary targets for subsequent oil and gas exploration in the study area due to their excellent internal storage reservoir physical properties and external structural traps and hydrocarbon charging conditions. The study results can provide strong theoretical support for future oil and gas exploration of Baijiantan Formation in the study area.

Key words: braided river delta, sedimentary facies, Member 3 of Baijiantan Formation, oil and gas exploration, Mahu Sag

CLC Number:

TE122.1

Wu Xin, Hu Xiaoyun, Han Lei, Xu Xin, Peng Xuehong, Liang Tao, Zeng Yulan, Li Weifeng. Sedimentary Facies of Member 3 of the Upper Triassic Baijiantan Formation in the Western Slope Area of Mahu Sag and Its Significance for Hydrocarbon Exploration[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 1-8.

References

[1] 赵文智,胡素云,郭绪杰,等.油气勘探新理念及其在准噶尔盆地的实践成效[J].石油勘探与开发,2019,46(5):811-819.
ZHAO Wenzhi,HU Suyun,GUO Xujie,et al.New concepts for deepening hydrocarbon exploration and their application effects in the Junggar Basin,NW China[J].Petroleum Exploration and Development,2019,46(5):811-819.
[2] 唐勇, 郭文建,王霞田,等.玛湖凹陷砾岩大油区勘探新突破及启示[J].新疆石油地质, 2019,40(2):127-137.
TANG Yong,GUO Wenjian,WANG Xiatian,et al.A new breakthrough in exploration of large conglomerate oil province in Mahu Sag and its implications[J].Xinjiang Petroleum Geology,2019,40(2):127-137.
[3] 陈永波,程晓敢,张寒,等.玛湖凹陷斜坡区中浅层断裂特征及其控藏作用[J].石油勘探与开发,2018,45(6):985-984.
CHEN Yongbo,CHENG Xiaogan,ZHANG Han,et al.Fault characteristics and control on hydrocarbon accumulation of middle-shallow layers in the slope zone of Mahu Sag, Junggar Basin,NW China[J].Petroleum Exploration and Development,2018,45(6):985-984.
[4] 杨红霞,陈雪昆,田雨桐,等.玛湖凹陷斜坡区下乌尔禾组沸石类矿物形成机理[J].新疆石油地质,2019,40(6):658-665.
YANG Hongxia,CHEN Xuekun,TIAN Yutong,et al.Forming mechanism of zeolites in Lower Wuerhe Formation in slope area of Mahu Sag[J].Xinjiang Petroleum Geology,2019,40(6):658-665.
[5] 张顺存,黄立良,冯右伦,等.准噶尔盆地玛北地区三叠系百口泉组储层成岩相特征[J]. 沉积学报,2018,36(2):354-365.
ZHANG Shuncun,HUANG Liliang,FENG Youlun,et al.Diagenetic facies of Triassic Baikouquan Formation in Mabei Area, Junggar Basin[J].Acta Sedimentologica Sinica,2018,36(2):354-365.
[6] 袁晓光,李维锋,张宝露,等.玛北斜坡百口泉组沉积相与有利储层分布[J].特种油气藏, 2015,22(4):70-73.
YUAN Xiaoguang,LI Weifeng,ZHANG Baolu,et al.Sedimentary facies and favorable reservoir distribution of Baikouquan Formation in Mabei slope area[J].Special Oil & Gas Reservoirs,2015,22(4):70-73.
[7] 赵一璇.塔东南坳陷侏罗系康苏组沉积特征[J].特种油气藏,2018,25(3):37-43.
ZHAO Yixuan.Sedimentary pattern of Jurassic Kangsu Formation in southeast depression of Tarim Basin[J].Special Oil & Gas Reservoirs,2018,25(3):37-43.
[8] 郑胜.准中地区三工河组浅水三角洲沉积模式及油气勘探意义[J].特种油气藏,2019, 26(1):87-93.
ZHENG Sheng.Sedimentary pattern of the shallow-water delta in the Sangonghe Formation of central Junggar Basin and its significance for hydrocarbon exploration[J].Special Oil & Gas Reservoirs,2019,26(1):87-93.
[9] 李维锋,何幼斌,彭德堂,等.新疆尼勒克地区下侏罗统三工河组辫状河三角洲沉积[J]. 沉积学报,2001,19(4):512-516.
LI Weifeng,HE Youbin,PENG Detang,et al.Braided-river Delta of the Lower Jurassic Sangonghe Formation in the Nileke Region,Xinjiang[J].Acta Sedimentologica Sinica,2001,19(4):512-516.
[10] 陈东阳,王峰,陈洪德,等.鄂尔多斯盆地东部府谷天生桥剖面上古生界下石盒子组₈段辫状河储层构型表征[J].石油与天然气地质,2019,40(2):335-345.
CHEN Dongyang,WANG Feng,CHEN Hongde,et al.Characterization of braided river reservoir architecture of the Upper Paleozoic He₈ member on Fugu Tianshengqiao outcrop,eastern Ordos Basin[J].Oil & Gas Geology,2019,40(2):335-345.
[11] 段志强,李进步,白玉奇,等. 辫状河储层构型表征及对含气饱和度空间分布的控制:以苏里格气田SX密井网区为例[J].大庆石油地质与开发,2020,39(5):1-9.
DUAN Zhiqiang,LI Jinbu,BAI Yuqi,et al. Configuration characterization of the braided river reservoirs and its controls on the spatial distribution of the gas saturation:taking SX infill well block in Sulige Gasfield as an example[J].Petroleum Geology & Oilfield Development in Daqing,2020,39(5):1-9.
[12] 张瑞香,王延章,孔雪,等.断陷湖盆辫状河三角洲储层构型解剖——以东辛油田营66断块沙二段为例[J].断块油气田,2020,27(2):165-170.
ZHANG Ruixiang,WANG Yanzhang,KONG Xue,et al.Architecture analysis of braided river delta reservoir in rift lake basin: taking second Member of Shahejie Formation in Ying 66 fault block of Dongxin Oilfield as an example[J].Fault-Block Oil & Gas Field,2020,27(2):165-170.
[13] 齐荣,李良,秦雪霏.鄂尔多斯盆地北缘近源砂砾质辫状河砂体构型与含气性[J].石油实验地质,2019,41(5):682-690.
QI Rong,LI Liang,QIN Xuefei.Sand body configuration and gas-bearing properties of near source sand-gravel braided river on the northern margin of Ordos Basin[J].Petroleum Geology & Experiment,2019,41(5):682-690.