Comparison between control factors of high quality continental reservoirs in Bohai Bay basin and Ordos basin

2008 ◽  
Vol 2 (1) ◽  
pp. 83-95 ◽  
Author(s):  
Junmao Zheng ◽  
Jun You ◽  
Dongbo He
Keyword(s):  
Ordos Basin ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
High Quality ◽  
Control Factors

Predictive distribution of high-quality tight reservoirs of coarse clastic rocks by linking diagenesis to sedimentary facies: Evidence from the upper Sha 4 Member in the northern Bonan Sag, Bohai Bay Basin, eastern China

2018 ◽  
Vol 6 (2) ◽  
pp. T413-T429 ◽  
Author(s):  
Dong Wu ◽  
Xiantai Liu ◽  
Yushan Du ◽  
Long Jiang ◽  
Ziyan Cheng
Keyword(s):  
Eastern China ◽  
Sedimentary Facies ◽  
Middle Part ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
High Quality ◽  
Clastic Rocks ◽  
Bonan Sag ◽  
Tight Reservoirs ◽  
Channel Deposits

Coarse clastic rocks of the upper Sha 4 Member in the northern Bonan Sag of the Bohai Bay Basin in eastern China are important hydrocarbon reservoirs. The deposits are tight reservoirs owing to the low porosity (less than 10%) and low permeability (less than 1 mD). Because of the strong heterogeneity, although the reserve in the northern Bonan Sag is remarkable, only 4.9% of the reserves are recovered. We have studied these tight reservoirs by linking diagenesis to sedimentary facies to help predict the distribution of high-quality tight reservoirs. Petrographic analysis is undertaken based on cores, thin sections, X-ray diffraction and scanning electron microscope, helpful to understand the impacts on tight reservoirs of sedimentary factors and diagenesis factors. Sedimentary microfacies, lithologic characteristics, reservoir property, diagenesis, and diagenetic minerals are studied. Coarse clastic rocks are deposited mainly in nearshore subaqueous fans and fan deltas. The multistage sandstones are the valid reservoirs of coarse clastic rocks and dominated by feldspathic litharenite, lithic arkose, and arkose. The reservoir property is poor principally owing to the strong compaction and cementation. Pores are composed of secondary pores and primary pores. The secondary pore, generated in the dissolution of detrital minerals and/or cements, is the major type of pores and important to porosity improvement. By linking diagenesis to sedimentary facies, it can be concluded that high-quality tight reservoirs of coarse clastic rocks of the upper Sha 4 Member in the northern Bonan Sag of Bohai Bay Basin in eastern China are associated with medium to coarse-grain sandstones, found in the middle part of underwater distributary channel deposits in fan deltas and in the middle part of underwater channel deposits in nearshore subaqueous fans, with abundant secondary porosity but low cement contents, vertically at depths ranging from 3500 to 4100 m.

scholarly journals Distribution characteristics and its controlling factor of lacustrine high-quality source rocks in the Bozhong sag, Bohai Bay Basin

2019 ◽  
Vol 4 (3) ◽  
pp. 227-237 ◽  
Author(s):  
Hefeng Sun ◽  
Lifang Liu ◽  
Xue Jiang ◽  
Shengbing Huang ◽  
Mingyang Geng ◽  
...  
Keyword(s):  
Controlling Factor ◽  
Source Rocks ◽  
Bohai Bay ◽  
Distribution Characteristics ◽  
Bohai Bay Basin ◽  
High Quality

scholarly journals A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiao-Feng Du ◽  
Hao Liu ◽  
Xiao-Bo Huang ◽  
Zhang-Qiang Song ◽  
Wei Xu ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Steep Slope ◽  
Bohai Bay ◽  
Rift Basin ◽  
Bohai Bay Basin ◽  
High Quality ◽  
Early Oligocene ◽  
Near Shore ◽  
Shahejie Formation ◽  
High Quality Reservoir

Abstract A comprehensive sedimentary and reservoir analysis was conducted based on seismic, well logging, core and relative test data, taking Members 1 and 2 of Shahejie Formation of the early Oligocene in the steep slope belt, eastern Shijiutuo Uplift (STU), Bohai Bay Basin (BBB) as a case. The study indicates that a near-shore mixed fan deposit formed in the study area and developed characteristics and pattern of a high-quality reservoir. The mixed clastic-carbonate rocks constitute Members 1 and 2 of Shahejie Formation which developed along the steep slope belt and is named as a near-shore mixed fan. The mixed fan of the study area is mainly composed of microfacies of proximal channel, mixed deposited channel, mixed clastic beach, mixed bioclastic (grain) beach, with vertical multi-stage superimposition feature, and basically a similar shape as modern near-shore fans. It constitutes a new depositional type developing in the steep slope belt of a characteristic and complex lacustrine rift basin in the study area. This mixed fan in the steep slope of eastern STU is controlled by comprehensive factors including tectonics, clastic material supply, climate, palaeogeomorphology and hydrodynamic conditions. The reservoir quality of Members 1 and 2 of Shahejie Formation of eastern STU is, however, actually controlled by the sedimentary environment and diagenesis processes. Coarse-grained mixed rocks of near-shore fans, rich in bioclastics, can form excellent reservoirs, characterized by resistance to compaction, easy to dissolution, little influenced by burial depth and high production of oil and gas, which enable them become key exploration targets of medium-deep strata of BBB. Analyses of high-quality reservoir, its controlling factors and the oil and gas exploration implications of the near-shore mixed fan developing in the study area give a deeper insight into discussions of the same type of mixed rocks of other lacustrine rift basins worldwide.

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