Quantitative Characterization of Architecture Units for Braided River Reservoir in Su36-11 EOR Test Area

Abstract

Abstract: Braided channel bar and braided channel are important oil and gas accumulation sandbodies, which are characterized by rapid lateral variation, poor continuity and connectivity, strong reservoir heterogeneity and significantly difference of sandbody scale from area to area and from type to type. These features seriously constrain the development of the braided river reservoir. Based on the reservoir architecture theory, this paper quantitatively characterizes the architecture units of the braided river reservoir of the lower He-8 Member (i.e. H₈x) in Su36-11 EOR test area of Sulige Gas Field and analyzes the effective sandbody distribution. The results show that the width of a single braided channel ranges from 100 to 550 m, and the length and width of braided bars are 1,350~4,300 m and 480~1,950 m, respectively. Finally, based on the development scale and distribution of sedimentary microfacies units, together with the production performance data, effective sandbodies are comprehensively evaluated. According to the evaluation results, channel bars and braided channels are distributed continuously in H₈x^1-3 and H₈x^2-3 and they are both effective sandbodies, with high drilling ratio, suggesting H8x1-3 and H₈x^2-3 as the most favorable target horizons. The channel bars in H₈x^1-2 and H₈x^2-2 have high drilling ratio and island-like channel bars are favorable reservoir sandbodies. Gas may be discovered in only a few channel bars in H₈x^1-2 and H₈x^2-2, so that the risks to develop the 2 horizons will be the highest.

Key words: Sulige Gas Field, Shihezi Formation, lower He-8 member (H₈x), braided river reservoir, quantitative architecture unit characterization, effective sandbody distribution

ZHAO Zhongjun, LI Jinbu, MA Zhixin, WU Xiaoning, FU Bin, WANG Wensheng. Quantitative Characterization of Architecture Units for Braided River Reservoir in Su36-11 EOR Test Area[J]. Xinjiang Petroleum Geology, 2017, 38(zk(English) ): 66-73.

References

[1] GE Yunlong, LU Jingtie, LIAO Baofang, et al. A braided river reservoir geological model-"pan-communicated sandbody"[J]. Petroleum Exploration and Development, 1998, 25(5): 77-79.
[2] ZHANG Changmin, YIN Taiju, ZHAO Lei, et al. Reservoir architectural analysis of braided channel[J]. Geological Science and Technology Information, 2013, 32(4): 7-13.
[3] SUN Tianjian, MU Longxin, ZHAO Guoliang.Classification and characterization of barrier-intercalation in sandy braided river reservoirs: taking Hegli oilfield of Muglad basin in Sudan as an example[J]. Petroleum Exploration and Development, 2014, 41(1): 112-120.
[4] BRIDGE J S, MACKEY S D.A revised alluvial stratigraphy model [M]. Oxford, UK: Blackwell Publishing, 1993: 319-336.
[5] YANG Lisha, CHEN Bintao, LI Shunli, et al. Pattern of genesis-based mudstone distribution for sandy braided river: a case study of sandy braided-river outcrop, Datong, Shanxi province, China[J]. Natural Gas Geoscience, 2013, 24(1): 93-98.
[6] JIN Zhenkui, YANG Youxing, SHANG Jianlin, et al. Sandbody architecture and quantitative parameters of single channel sandbodies of braided river: cases from outcrops of braided river in Fukang, Liulin and Yanan areas[J]. Natural Gas Geoscience, 2014, 25(3): 311-317.
[7] LIU Yuming, HOU Jiagen, WANG Lianmin, et al. Architecture analysis of braided river reservoir[J]. Journal of China University of Petroleum (Edition of Natural Science), 2009, 33(1): 7-17.
[8] LIU Jinku, SUN Yongliang, XIE Jinmei.Hydrodynamic energy-based sedimentary microfacies distribution of He-8 member of Lower Shihezi formation in Block-25, Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2016, 37(1): 24-28.
[9] XIE Qingbin, TAN Xinyu, GAO Xia, et al. Characteristics of major gas-bearing reservoirs in western Sulige Gas Field[J]. Lithologic Reservoirs, 2014, 26(4): 57-65.
[10] MIALL A D.Architectural elements bounding surfaces in fluvial deposits: anatomy of the Kayenta formation (Lower Jurassic), Southwest Colorado[J]. Sedimentary Geology, 1988, 55(3-4): 233-262.
[11] MIALL A D.Reconstructing the architecture and sequence stratigraphy of the preserved fluvial record as a tool for reservoir development: a reality check[J]. AAPG Bulletin, 2006, 90(7): 989-1 002.
[12] JU Zilong, TANG Hui, LIU Weixin, et al. Sub-layer correlation method and application based on braided river outcrop geometric model: a case study of Enping formation in oilfield A, Pearl River Mouth basin[J]. Xinjiang Petroleum Geology, 2016, 37(2): 179-185.
[13] QU Xuejiao, YANG Lei, GAO Youfeng, et al. Characteristics of the volcanic and sedimentary rocks, prediction of the favorable areas for member 1 of Yingcheng formation in Changde gasfield of Songliao basin[J]. Petroleum Geology ＆ Oilfield Development in Daqing, 2014, 33(3): 7-13.
[14] CHEN Yukun, WU Shenghe, MAO Ping, et al. Characterization of sandy braided river reservoir configuration-an example from Guantao formation in Yangsanmu oilfield, Dagang oil region[J]. Xinjiang Petroleum Geology, 2012, 33(5): 523-526.
[15] KELLY S.Scaling and hierarchy in braided river and their deposits: examples and implication for reservoir modeling [M]// SAM-BROOK SMITH G H, BEST J L, BRISTOW C S, et al. Braided rivers: process, deposits, ecology and management. Oxford, UK: Blackwell Publishing, 2006: 75-106.