Based on the observation results of cores, structural analysis, sedimentary microfacies analysis, lithologic analysis and other analytical tests and logging data, the characteristics of lithology and lithofacies of the Member Chang7 tight oil reservoir of the Triassic Yanchang Formation in Heshui area are described and summarized and the criteria for identification of lithology and lithofacies by logging are established. The lithofacies in the Chang7 tight oil reservoir were classified into five types: fine sandstone deposited by sandy debris flow, turbidite fine siltstone, fine sandstone deposited by slump, semi-deep to deep lacustrine mudstone, and oil shale. The lithology and lithofacies in the Chang7 tight oil reservoir were characterized, both qualitatively and quantitatively, with electric logging and imaging logging and several means and methods, the response characteristics of different lithology and lithofacies were summarized through analyzing the image log and conventional log data, and the parameters characterizing sandstone’s structures were used to quantitatively characterize the lithology and lithofacies, the criteria for identification of different lithology and lithofacies by logging were established. The vertical and horizontal identification and classification of lithology and lithofacies in a single well was then accomplished by processing the log data from each well, the results of lithology and lithofacies identification tally well with the results of formation testing. In-depth lithology and lithofacies analysis proves to be an important method of tight oil reservoir evaluation and “sweet spot” prediction.
[1] 赖锦, 王贵文, 郑懿琼. 川中蓬莱地区须二段储层岩性岩相类型及解释方法[J]. 断块油气田, 2013, 20(1): 33-37.
LAI Jin, WANG Guiwen, ZHENG Yiqiong. Types and interpretation methods of lithology and lithofacies of the second member of Xujiahe Formation in Penglai Area, Central Sichuan Basin[J]. Fault-Block Oil & Gas Field, 2013, 20(1): 33-37.
[2] 王俊玲, 任纪舜. 嫩江现代河流沉积体岩相及内部构形要素分析[J]. 地质科学, 2001, 36(4): 385-394.
WANG Junling, REN Jishun. Analysis on lithofacies and interior architectural elements of modern fluvial deposits in Nenjiang river, NE China[J]. Chinese Journal of Geology, 2001, 36(4): 385-394.
[3] 于兴河, 王德发, 孙志华. 湖泊辫状河三角洲岩相、层序特征及储层地质模型: 内蒙古岱海湖现代三角洲沉积考察[J]. 沉积学报, 1995, 13(1): 48-58.
YU Xinghe, WANG Defa, SUN Zhihua. Lithofacies types, vertical profile feature sand reservoir geological models of braided deltaic sandbodies in Faulted Lake Basin[J]. Acta Sedimentologica Sinica, 1995, 13(1): 48-58.
[4] 谢宗奎. 柴达木台南地区第四系细粒沉积岩相与沉积模式研究[J]. 地学前缘, 2009, 16(5): 245-250.
XIE Zongkui. Research on the Quaternary fine-fraction lithofacies and sedimentation model in Tainan Area, Qaidam Basin[J]. Earth Science Frontiers, 2009, 16(5): 245-250.
[5] 邱颖, 孟庆武, 李梯, 等. 神经网络用于岩性及岩相预测的可行性分析[J]. 地球物理学进展, 2001, 16(3): 76-84.
QIU Ying, MENG Qingwu, LI Ti, et al. The feasibility analysis of neural network in the prediction of lithology and lithofacies[J]. Progress in Geophysics, 2001, 16(3): 76-84.
[6] 李渭, 白薷, 李文厚. 鄂尔多斯盆地合水地区长6储层成岩作用与有利成岩相带[J]. 地质科技情报, 2012, 31(4): 22-28.
LI Wei, BAI Ru, LI Wenhou. Diagenesis and favorable diagenetic facies of the Chang 6 reservoir in Heshui Area, Ordos Basin[J]. Geological Science and Technology, 2012, 31(4): 22-28.
[7] 廖继佳, 朱筱敏, 邓秀芹, 等. 鄂尔多斯盆地陇东地区延长组重力流沉积特征及其模式[J]. 地学前缘, 2013, 20(2): 29-39.
LIAO Jijia, ZHU Xiaomin, DENG Xiuqin, et al. Sedimentary characteristics and model of gravity flow in Triassic Yanchang Formation of Longdong Area in Ordos Basin[J]. Earth Science Frontiers, 2013, 20(2): 29-39.
[8] 杨华, 李士祥, 刘显阳, 等. 鄂尔多斯盆地致密油、页岩油特征及资源潜力[J]. 石油学报, 2013, 34(1): 1-11.
YANG Hua, LI Shixiang, LIU Xianyang, et al. Characteristics and resource prospects of tight oil and shale oil in Ordos Basin[J]. Acta Petrolei Sinica, 2013, 34(1): 1-11.
[1] 张才利, 张雷, 陈调胜, 等. 鄂尔多斯盆地延长组长7段沉积期物源分析及母岩类型研究[J]. 沉积学报, 2013, 31(3): 430-439.
ZHANG Caili, ZHANG Lei, CHEN Tiaosheng, et al. Provenance and parent-rock types of member 7 of Yanchang Formation(Triassic), Ordos Basin[J]. Acta Sedimentologica Sinica, 2013, 31(3): 430-439.
[2] 付金华, 邓秀芹, 张晓磊, 等. 鄂尔多斯盆地三叠系延长组深水砂岩与致密油的关系[J]. 古地理学报, 2013, 15(5): 624-634.
FU Jinhua, DENG Xiuqin, ZHANG Xiaolei, et al. Relationship between deepwater sandstone and tight oil of the Triassic Yanchang Formation in Ordos Basin[J]. Journal of Palaeogeography, 2013, 15(5): 624-634.
[3] 任战利, 李文厚, 梁宇, 等. 鄂尔多斯盆地东南部延长组致密油成藏条件及主控因素[J]. 石油与天然气地质, 2014, 35(2): 190-199.
REN Zhanli, LI Wenhou, LIANG Yu, et al. Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin[J]. Oil & Gas Geology, 2014, 35(2): 190-199.
[4] 蒲秀刚, 周立宏, 韩文中, 等. 歧口凹陷沙一下亚段斜坡区重力流沉积与致密油勘探[J]. 石油勘探与开发, 2014, 41(2): 138-149.
PU Xiugang, ZHOU Lihong, HAN Wenzhong, et al. Gravity flow sedimentation and tight oil exploration in lower first member of Shahejie Formation in slope area of Qikou Sag, Bohai Bay Basin[J]. Petroleum Exploration and Development, 2014, 41(2): 138-149.
[5] 冯胜斌, 牛小兵, 刘飞, 等. 鄂尔多斯盆地长7段致密油储层储集空间特征及其意义[J]. 中南大学学报(自然科学版), 2013, 44(11): 4574-4580.
FENG Shengbin, NIU Xiaobing, LIU Fei, et al. Characteristics of Chang7 tight oil reservoir space in Ordos basin and its significance[J]. Journal of Central South University(Science and Technology), 2013, 44(11): 4574-4580.
[6] 田建锋, 高永利, 张蓬勃, 等. 鄂尔多斯盆地合水地区长7段致密油储层伊利石成因[J]. 石油与天然气地质, 2013, 34(5): 700-707.
TIAN Jianfeng, GAO Yongli, ZHANG Pengbo, et al. Genesis of illite in Chang 7 tight oil reservoir in Heshui area, Ordos Basin[J]. Oil & Gas Geology, 2013, 34(5): 700-707.
[7] 李潮流, 李长喜, 侯雨庭, 等. 鄂尔多斯盆地延长组长7段致密储集层测井评价[J]. 石油勘探与开发, 2015, 42(5): 1-7.
LI Chaoliu, LI Changxi, HOU Yuting, et al. Well logging evaluation of Triassic Chang 7 Member tight reservoirs, Yanchang Formation, Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2015, 42(5): 1-7.
