Lithofacies paleogeography mapping and reservoir prediction in tight sandstone strata: A case study from central Sichuan Basin, China
Lithofacies paleogeography mapping and reservoir prediction in tight sandstone strata: A case study from central Sichuan Basin, China
复制标题
致密砂岩地层岩相古地理测绘与储层预测——以四川盆地中部地区为例
DOI：
10.1016/j.gsf.2016.09.002
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发表时间：
2017-09
影响因子：
8.9
通讯作者：
Cao Jian
中科院分区：
文献类型：
--
作者：
Zhong Yuan;Zhou Lu;Tan Xiucheng;Lian Chengbo;Liu Hong;Liao Jijia;Hu Guang;Liu Mingjie;Cao Jian
富砂致密砂岩储层是油气勘探的潜力区。然而，砂岩厚度与地层厚度的比值很大，这给传统的岩相古地理填图带来了许多挑战和不确定性。因此，储层甜点的预测一直是石油勘探领域的难题。通过对四川盆地中部浅水辫状河三角洲典型现代富砂层沉积特征的分析，为解决这一问题提供了新的思路。辫状河三角洲环境中的富砂层类型包括原生辫状河道和次生分流河道，沉积物的分布受古地貌谷中沉积的连续叠置层控制。一级分流河道水动力较强，粗砂沉积比例高于二级分流河道。因此，岩相古地理填图受地貌、河谷位置和河道迁移的控制。恢复了须家河组沉积前的古地貌和河谷体系。在此基础上，建立了基于取心资料的粗骨架砂体岩电识别模型。研究结果表明，原生分流河道骨架砂体主要发育在河谷和低洼地带，而次生分流河道和细砂体则多发育在高地地区。骨架砂体厚度分布与岩相古地理图显示，原生分流河道与储层厚度呈正相关。不同沉积相与岩石物理性质之间存在显著的相关性。此外，不同沉积相的储层发育程度表明，该填图方法可靠地预测了甜点的分布。该成图方法的应用和认识为区域性致密砂岩油气藏勘探提供了参考。
Sand-rich tight sandstone reservoirs are potential areas for oil and gas exploration. However, the high ratio of sandstone thickness to that of the strata in the formation poses many challenges and uncertainties to traditional lithofacies paleogeography mapping. Therefore, the prediction of reservoir sweet spots has remained problematic in the field of petroleum exploration. This study provides new insight into resolving this problem, based on the analyses of depositional characteristics of a typical modern sand-rich formation in a shallow braided river delta of the central Sichuan Basin, China. The varieties of sand-rich strata in the braided river delta environment include primary braided channels, secondary distributary channels and the distribution of sediments is controlled by the successive superposed strata deposited in paleogeomorphic valleys. The primary distributary channels have stronger hydrodynamic forces with higher proportions of coarse sand deposits than the secondary distributary channels. Therefore, lithofacies paleogeography mapping is controlled by the geomorphology, valley locations, and the migration of channels. We reconstructed the paleogeomorphology and valley systems that existed prior to the deposition of the Xujiahe Formation. Following this, rock-electro identification model for coarse skeletal sand bodies was constructed based on coring data. The results suggest that skeletal sand bodies in primary distributary channels occur mainly in the valleys and low-lying areas, whereas secondary distributary channels and fine deposits generally occur in the highland areas. The thickness distribution of skeletal sand bodies and lithofacies paleogeography map indicate a positive correlation in primary distributary channels and reservoir thickness. A significant correlation exists between different sedimentary facies and petrophysical properties. In addition, the degree of reservoir development in different sedimentary facies indicates that the mapping method reliably predicts the distribution of sweet spots. The application and understanding of the mapping method provide a reference for exploring tight sandstone reservoirs on a regional basis.
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DOI：
--
发表时间：
2008
期刊：
Journal of Southwest Petroleum University
影响因子：
--
作者：
Peng Jun
通讯作者：
Peng Jun
影响因子：
2.7
作者：
M. Mousavi;S. Bryant
通讯作者：
M. Mousavi;S. Bryant
上三叠统T3x5烃源岩（四川盆地川西坳陷）及其生排烃特征评价：对致密砂岩气、页岩气成藏潜力评价的启示
影响因子：
5.4
作者：
Yingchun Guo;Xiongqi Pang;Dongxia Chen;Keming Yang;Zhenxue Jiang;Xiaopeng Zhang;Fujie Jiang
通讯作者：
Fujie Jiang
影响因子：
0.7
作者：
Hua Yang;Jinhua Fu;Daxing Wang
通讯作者：
Hua Yang;Jinhua Fu;Daxing Wang
影响因子：
7.5
作者：
Zecheng Wang;Wenzhi Zhao;Zong-yin Li;Xing-fu Jiang;Jun Li
通讯作者：
Zecheng Wang;Wenzhi Zhao;Zong-yin Li;Xing-fu Jiang;Jun Li