Types of DeepGWater Gravity Flow Deposits and Related Reservoirs: A Casefrom the Lashizhong Formation of Ordovician onthe Western Margin of Ordors Basin
-
摘要:
深水重力流的沉积类型及储集性能一直是沉积学领域研究的重点。此次研究以野外露头为基础，结合室内薄片分析，对鄂尔多斯盆地西缘奥陶系拉什仲组深水重力流沉积类型与储集性能进行了详细研究。拉什仲组以灰绿色砂岩及灰黑色泥岩为主, 另见少量的粉砂岩和砾岩。槽模、交错层理、粒序层理及包卷层理等发育。通过岩性、沉积构造、古生物等分析，认为拉什仲组沉积环境为深水，沉积相主要为海底扇，水道和朵叶微相较为发育。水道可进一步分为复合型、垂向加积型、迁移型。复合型水道岩性以砂岩为主，粒度较粗，水道内部发育次级水道。垂向加积型水道岩性为细砂岩和粉砂岩，以垂向加积沉积为主。迁移型水道定向迁移特征明显，侧积体发育。从下至上，砂岩含量先减少，再增加，大致反映相对海平面升—降旋回，海底扇总体呈退积沉积序列。孔隙度及渗透率测试结果表明，复合型水道储集潜力最好，朵叶和迁移型水道次之。
Abstract:The depositional types and reservoir properties of deep-water gravity flow deposits have been the focus of consideration of sedimentology for long. Based on the field study of outcrops and laboratory examination of thin-sections, these questions are studied in details in this paper for the Ordovician Lashizhong Formation on the western margin of the Ordos Basin. The Lashizhong Formation mainly consists of grayish-green sandstone and dark-gray mudstone, with a little of siltstone and conglomerate. Flute casts, cross bedding, graded bedding and convolute bedding are well developed. Based on the integrated study of lithologic characters, sedimentary structures and fossils, it is inferred that the Lashizhong Formation is deposited in an environment of deep-water, dominated by submarine fan with channel and lobe microfacies. The deep-water channel could be further divided into complex, vertically accretionary and migrational channel deposits. The complex channel is dominated by coarse sandstone with well developed secondary channels. The vertical accretionary channel is mainly filled by fine sandstone and siltstone as the result of vertical accretion. As to the migrational channel deposits, it is characterized by unidirectional migration and lateral accretionary bodies are well developed. From bottom to top, the sandstone decreases first and then increases, as the results of relative sea level fluctuation, and the submarine fans as a whole are in a sequence of retrogradation. The laboratory examination of porosity and permeability shows that the complex channel deposits have best reservoir properties, followed by lobe and migrational channel deposits.
-
Key words:
- channel /
- gravity flow /
- submarine fan /
- Lashizhong Formation /
- Ordovician /
- Ordos Basin
-
-
表 1 研究区沉积相类型及特征
Table 1. Types and characteristics of sedimentary facies in the study area
相 亚相 微相 规模 岩性 沉积构造 海底扇 中扇 复合型水道 大 砂岩、少量砾岩 交错层理、槽模、粒序层理 垂向加积水道 较大 砂岩、粉砂岩 平行层理、粒序层理 迁移型水道 大 砂岩 平行层理、粒序层理 外扇 朵叶 小 砂岩、泥岩 平行层理、底模 
下载: 导出CSV
表 2 研究区重力流沉积物性统计表
Table 2. Statistics of physical properties of gravity flow deposits in the study area
沉积物性 复合型水道 迁移型水道 垂向加积型水道 朵叶 最大渗透率/10-3μm2 0.386 0.155 0.538 0.144 最小渗透率/10-3μm2 0.099 0.108 0.144 0.115 平均渗透率/10-3μm2 0.137 0.132 0.212 0.123 最大孔隙度/% 18.143 2.645 3.304 4.058 最小孔隙度/% 0.488 0.597 0.440 0.434 平均孔隙度/% 2.324 1.408 1.711 1.400
下载: 导出CSV
-
[1] 李华, 何幼斌, 冯斌, 等.鄂尔多斯盆地西缘奥陶系拉什仲组深水水道沉积类型及演化[J].地球科学, 2018, 43(6):2149-2159. http://www.cnki.com.cn/Article/CJFDTotal-DQKX201806027.htm
[2] 肖彬, 何幼斌, 罗进雄, 等.内蒙古桌子山中奥陶统拉什仲组岩石特征及沉积环境[J].科技导报, 2013, 31(34):45-51. http://d.old.wanfangdata.com.cn/Periodical/kjdb201334012
[3] 费安玮.鄂尔多斯盆地拉什仲组遗迹化石组合与古环境[J].高校地质学报, 2001, 7(3):278-287 http://www.cqvip.com/QK/90539X/200103/5489014.html
[4] 王振涛, 周洪瑞, 王训练, 等.鄂尔多斯盆地西缘北部奥陶纪盆地原型:来自贺兰山和桌子山地区奥陶系的沉积响应[J].地质论评, 2016, 62(4):1041-1061. http://www.cqvip.com/QK/91067X/201604/669572920.html
[5] 丁海军, 徐焕华.浊流与等深流的流态转化[J].新疆石油地质, 2009, 30(1):87-91. http://www.cqvip.com/QK/71135X/201107/29258717.html
[6] 李向东, 阙易, 郇雅棋.桌子山中奥陶统克里摩里组下段薄层状石灰岩垂向序列分析[J].地球科学进展, 2017, 32(3):276-291. http://www.cqvip.com/QK/94287X/201703/672179794.html
[7] 郑荣才, 郑哲, 高博禹, 等.珠江口盆地白云凹陷珠江组海底扇深水重力流沉积特征[J].岩性油气藏, 2013, 25(2):1-8. http://www.cnki.com.cn/Article/CJFDTotal-YANX201302003.htm
[8] 李华, 何幼斌, 黄伟, 等.鄂尔多斯盆地南缘奥陶系平凉组深水沉积特征及其与古环境关系——以陕西富平赵老峪地区为例[J].沉积学报, 2018, 36(3):483-499. http://www.cqvip.com/QK/95994X/20183/675281382.html
[9] 李华, 何幼斌, 王振奇.深水高弯度水道——堤岸沉积体系形态及特征[J].古地理学报, 2011, 13(2):139-149. http://www.cnki.com.cn/Article/CJFDTotal-GDLX201102004.htm
[10] 高振中, 罗顺社, 何幼斌, 等.鄂尔多斯西缘奥陶纪海底扇沉积体系[J].石油与天然气地质, 1995, 16(2):119-125, 203. http://www.cnki.com.cn/Article/CJFDTOTAL-SYYT502.003.htm
[11] 王振涛, 周洪瑞, 王训练, 等.鄂尔多斯盆地西南缘奥陶纪地质事件群耦合作用[J].地质学报, 2015, 89(11):1990-2004. http://www.cnki.com.cn/Article/CJFDTotal-DZXE201511011.htm
[12] 靳子濠, 周立宏, 操应长, 等.渤海湾盆地黄骅坳陷二叠系砂岩储层储集特征及成岩作用[J].天然气地球科学, 2018, 29(11):1595-1607. http://www.cqvip.com/QK/97226X/201811/676852716.html
[13] 贺钦.江汉盆地新沟嘴组泥质白云岩储集特征及勘探潜力[J].江汉石油职工大学学报, 2019, 32(3):31-33. http://www.cqvip.com/QK/83755X/201903/7002230029.html
[14] 王建东, 王昌, 曹海防, 等.准噶尔盆地中部4区块致密砂岩有效储集层物性下限[J].新疆石油地质, 2018, 39(5):609-613. http://www.cqvip.com/QK/93464X/20185/7000846153.html
[15] 王杨, 张鹏, 畅斌, 等.鄂尔多斯盆地西北部Y油区延长组致密储层特征研究[J].西安文理学院学报(自然科学版), 2019, 22(4):91-96. https://www.zhangqiaokeyan.com/academic-journal-cn_journal-xi-university-natural-science-edition_thesis/0201272960830.html
[16] 张鹏辉, Lee Yong Ⅱ, 张金亮, 等.砂岩储集层粒间孔隙保存机制[J].天然气工业, 2019, 39(7):31-40. http://www.cnki.com.cn/Article/CJFDTotal-TRQG201907006.htm
[17] 张航, 廖明光, 姚泾利, 等.致密砂岩储层自生矿物特征及其对储集性能的影响——以鄂尔多斯盆地陇东地区长3油组为例[J].沉积与特提斯地质, 2017, 37(3):22-31. http://www.cnki.com.cn/Article/CJFDTOTAL-TTSD201703003.htm
[18] Kane I A, Kneller B C, Dykstra M, et al. Anatomy of a submarine channel -levee: an example from Upper Cretaceous slope sediments, Rosario Formation, Baja California, Mexico [J]. Marine and Petroleum Geology, 2007, 24(6/9): 540-563.
[19] Hickson T H, Lowe D R. Facies architecture of a submarine fan channel-levee complex: the Juniper Ridge Conglomerate, Coalinga, California[J]. Sedimentology, 2002, 49(2): 335-362. https://www.researchgate.net/publication/230119408_Facies_architecture_of_a_submarine_fan_channel-levee_complex_The_Juniper_Ridge_Conglomerate_Coalinga_California
[20] Schwarz E, Arnott R W C. Anatomy and evolution of a slope channel complex set (Neoproterozoic Isaac Formation, Windermere Supergroup, southern Canadian Cordillera):implications for reservoir characterization[J]. Journal of Sedimentary Research, 2007, 77(2): 89-109. https://www.researchgate.net/publication/250082838_Anatomy_and_Evolution_of_a_Slope_Channel-Complex_Set_Neoproterozoic_Isaac_Formation_Windermere_Supergroup_Southern_Canadian_Cordillera_Implications_for_Reservoir_Characterization
-
图(5)
表(2)
计量
- 文章访问数: 607
- PDF下载数: 18
- 施引文献: 0