层序界面对砂岩成岩作用及储层质量的影响——以鄂尔多斯盆地延河露头上三叠统延长组为例
- 中国矿业大学(北京)资源与地球科学系 北京 100083
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2007-12-10
摘要: 砂岩成岩作用及储层质量是油气勘探的重要研究内容，不同地区砂岩成岩作用及储层质量的主要控制因素各不相同。本文以鄂尔多斯盆地东部延河露头剖面延长组长7上部—长4+5中部三角洲前缘—三角洲平原沉积为例，重点讨论三级层序界面（长16底）上下不同基准面半旋回中砂岩自生矿物、储集空间类型、储集性能和含油性差异及造成这些差异的原因。指出层序界面之下的下降半旋回中浊沸石和早期钙质砂岩结核的发育阻止了绿泥石等粘土矿物及自生石英和自生钠长石的发育，而界面之上的上升半旋回中因凝灰质不足以及地层温度较低造成浊沸石发育有限，加之受湖水影响较小而缺乏早期方解石胶结物，因而绿泥石等自生粘土矿物及自生石英和自生钠长石较为发育，并保留了一部分原生孔隙。层序界面及紧邻其上大规模发育的长16砂体成为流体运移的优势通道，是界面之上浊沸石、方解石胶结物及长石颗粒被酸性流体溶蚀形成次生孔隙的重要因素，也是石油的重要运移通道和储集体。
Effect of Sequence Boundary on Sandstones Diagenesis and Reservoir Quality: 〖WTBZ〗an outcrop study from the Upper TriassicYanchang Formation, Ordos Basin, Northwest China
- Department of Resources and Earth Science, China University of Mining and Technology, Beijing 100083
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2007-12-10
Abstract: Diagenesis and reservoir quality in sandstones are important research scopes for petroleum exploration. Taking the delta front to delta plain facies from upper Chang 7 to middle Chang 4+5 member of Yanchang Formation, Yanhe River outcrop, eastern Ordos Basin as an example, this paper addresses the differences of authigenetic minerals, porosity types, petrophysical attributes and oilshowing in sandstones between baselevel semirising and semidowning cycles, and their origins. Both of abundant laumontite and early calcite cement in concretion prevent the formation of authigenetic minerals including chlorite, chlorite/smectite, quartzovergrowth and albiteovergrowth in baselevel semidowning cycle under the 3rd sequence stratigraphic boundary surface, whereas authigenetic chlorite, chlorite/smectite, quartzovergrowth and albiteovergrowth are relatively well developed resulting from poor development of laumontite cement owing to lack of tuffaceous deposites and lower formation temperature, and lack of early calcite cement due to little influence of lake in baselevel semirising cycle above the 3rd sequence stratigraphic boundary sequence. The 3rd sequence boundary surface together with well developed Chang16sandbodies immediately above the sequence boundary surface was the predominant fluid conduits through which acidic fluid, which dissolved laumontite and calcite cement and feldspar grains, and oil migrated originated from the mature source rocks.
罗 忠. 层序界面对砂岩成岩作用及储层质量的影响——以鄂尔多斯盆地延河露头上三叠统延长组为例[J]. 沉积学报, 2007, 25(6): 903-914.
| 引用本文: |
罗 忠. 层序界面对砂岩成岩作用及储层质量的影响——以鄂尔多斯盆地延河露头上三叠统延长组为例[J]. 沉积学报, 2007, 25(6): 903-914.
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LUO Zhong. Effect of Sequence Boundary on Sandstones Diagenesis and Reservoir Quality: 〖WTBZ〗an outcrop study from the Upper TriassicYanchang Formation, Ordos Basin, Northwest China[J]. Acta Sedimentologica Sinica, 2007, 25(6): 903-914.
| Citation: |
LUO Zhong. Effect of Sequence Boundary on Sandstones Diagenesis and Reservoir Quality: 〖WTBZ〗an outcrop study from the Upper TriassicYanchang Formation, Ordos Basin, Northwest China[J]. Acta Sedimentologica Sinica, 2007, 25(6): 903-914.
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