DIAGENETIC CONTROLS ON THE RESERVOIR QUALITY OF TIGHT OIL‐BEARING SANDSTONES IN THE UPPER TRIASSIC YANCHANG FORMATION, ORDOS BASIN, NORTH‐CENTRAL CHINA,Journal of Petroleum Geology

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DIAGENETIC CONTROLS ON THE RESERVOIR QUALITY OF TIGHT OIL‐BEARING SANDSTONES IN THE UPPER TRIASSIC YANCHANG FORMATION, ORDOS BASIN, NORTH‐CENTRAL CHINA
Journal of Petroleum Geology ( IF 1.8 ) Pub Date : 2020-03-17 , DOI: 10.1111/jpg.12759
Penghui Zhang _{1,

2,

3} , Yong Il Lee ₄ , Jinliang Zhang ₅

Affiliation

Tight oil‐bearing sandstones in the Chang 4+5, 6 and 7 Members of the Upper Triassic Yanchang Formation in the Ordos Basin, north‐central China, in general consist of fine‐grained, moderately‐ to poorly‐sorted lithic arkoses (average Q₅₃F₃₀R₁₇) deposited in a fluvial‐dominated lacustrine‐deltaic environment. Diagenetic modifications to the sandstones include compaction and cementation by calcite, dolomite, ankerite, quartz, chlorite, kaolinite and illite, as well as partial dissolution of feldspars and minor rock fragments. Porosity ranges up to ~7% of the rock volume and was reduced more by cementation than by compaction. Fractures (tectonic macrofractures and diagenetic microfractures) provide important oil migration pathways and enhance the sandstones' storage potential. The pore network is heterogeneous due to processes related to deposition and diagenesis, and there are considerable spatial variations in porosity and pore connectivity. The pore system includes both macropores and micropores, and pore network variations depend on the type and distribution of authigenic cements.

更新日期：2020-03-17

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