构造活动及层序格架约束下的沉积、成岩作用对储层质量的影响——以松辽盆地南部大情字井地区葡萄花油层为例

doi:10.11743/ogg20180207

Abstract

Abstract: The impact of sedimentation,diagenesis and tectonic activities upon reservoir quality in Putaohua oil layer of Daqingzijing area,southern Songliao Basin,was studied based on sequence stratigraphic theories through analyses of drilling and logging data,core and thin section observation,SEM images as well as lab testing results.The result shows that the sequence stratigraphic framework of Putaohua oil layer is mainly composed of a low stand system tract and a lake transgression tract,with the former containing some high-quality sandstone reservoirs in distributary channels and forks of the main stream and the latter with quality sandstone reservoirs in underwater distributary channels.Sedimentation constrained by the framework was found to control the vertical and horizontal distribution of sedimentary microfacies and the scales of sandbodies in these system tracts.Vertically,sandstone layers at the upper part of the low stand system tract are large in scale and good in connectivity,thus contain relatively high-quality reservoirs; and horizontally,reservoir properties of the main distributary channel sandstone and fork sandstone are better for oil and gas accumulation.Diagenesis and compaction were suggested to be the direct reason behind the low-permeability of Putaohua oil layer,while the sequence stratigraphic framework,which controlled an early diagenesis environment in both system tracts,was regarded to be a factor that strengthened to some extent the carbonate cementation of sandstone layers in the lake transgression system tract.The range and extent of dissolution there were thought to be determined by the properties of reservoirs,distribution of source rock-rooted faults and distance to these faults.Relatively high-quality reservoirs in the oil layer were controlled jointly by four factors,namely the sequence stratigraphic framework,sedimentation,diagenesis and tectonic activity,i.e. the main distributary channels at the central and upper part of the low stand system tract that were near to the source rock-rooted faults or bounded by the faults served as the major spots for high-quality reservoirs to take shape.

Key words: tectonic activity, sequence stratigraphy, reservoir, Putaohua oil layer, Daqingzijing area, Songliao Basin

CLC Number:

TE122.2

Cao Zheng, Lin Chengyan, Dong Chunmei, Ren Lihua, Song Lei, Xing Xinya, Ma Xiaolan. Impact of sedimentation and diagenesis upon reservoir quality under constraint of tectonic activities and sequence stratigraphic framework-A case study of Putaohua oil layer in Daqingzijing area of southern Songliao Basin[J]. Oil & Gas Geology, 2018, 39(2): 279-290.

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Impact of sedimentation and diagenesis upon reservoir quality under constraint of tectonic activities and sequence stratigraphic framework-A case study of Putaohua oil layer in Daqingzijing area of southern Songliao Basin

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