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- Title
母岩性质对砾岩储层中自生绿泥石发育的影响及 油气储层意义 ----以准噶尔盆地玛湖凹陷玛北地区下乌尔禾组为例
- Authors
晏奇; 雷海艳; 鲜本忠; 王剑; 罗正江; 杨召; 贺静; 牛君; 蒲强; 田荣恒
- Abstract
The conglomerate reservoirs discovered recently in the Mahu DepressionïŒJunggar Basin have been characterized as near-source, coarse-grained, deep-buried? and low-permeability. The conglomerate reservoir quality of the Lower Urhe Formation is closely related to the authigenic chlorite and its associated diagenesis. Petrology and mineralogy were studied for the Permian Lower Urhe Formation in the northern Mahu Depression using thin section observation, scanning electron microscopy electron probe and X-ray fluorescence (XRF) spectrum to clarify the content distributionïŒand genesis of authigenic chlorite and its impact on reservoir quality and to explore the reservoir difference mechanism of diagenesis. The research shows that: 1) The authigenic chlorites in the northern Mahu Depression belong to iron - magnesium transitional iron-rich chlorites produced by grain-coating, pore lining, and pore filling and controlled by iron-magnesium-rich volcanic material; 2) Four conglomerate fans were developed in the northern Mahu Depression, and the provenance properties of the source rock are obvious. The Xiayan and Madong fans along the slope of eastern Mahu Depression are characterized by the development of a combination of authigenic chlorites and laumontites ? while both the Xiazijie and Huangyangquan fans along the slope of the western Mahu Depression are characterized only by laumontite cementation. Different conglomerate reservoirs from various source rocks are characterized by obvious differences within their diagenetic sequence; 3) The conglomerate reservoir quality is closely related to the properties of their source rock. The precipitation of authigenic chlorites and laumontites along the slope of the eastern Mahu Depression leads to high cementation and tightness overall. The good reservoir depends on later fracturing. Due to the lack of authigenic chlorites along the slope of the western Mahu Depression ? the development of laumontite resists normal compaction and retains some of the primary poresï?Œproviding possible migration channels for the injection of later acidic fluids and laumontite dissolution. The conglomerate reservoirs located in the high part of the topography are possibly good quality due to a high degree of laumontite dissolution.
- Publication
Acta Sedimentologica Sinica, 2020, Vol 38, Issue 2, p367
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.l000-0550.2019.033