| 歧口凹陷沙河街组火山岩成岩作用及对储集性能的控制 |
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| 关键词:diagenesis reservoir performance volcanic rocks Shahejie Formation Qikou depression |
| 基金项目:国家自然科学基金项目(编号: 40872083)；国家科技重大专项(编号: 2008ZX05001-003-004; 2011ZX05001-002-008)；中国石油天然气股份公司重大科技专项(编号: 2008-030504)；西安石油大学青年科技创新基金项目(编号: 2010QN006) |
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| Diagenesis of Volcanic Rocks in Shahejie Formation of Qikou Depression and Its Control over Reservoir Performance |
| Based on the micro-examination of core observation data by means of polarization microscope and scanning electron microscope, the authors systematically studied the diagenesis of Shahejie Formation vocalic rocks in Qikou depression, and divided the diagenesis system of volcanic rocks into early diagenetic phase and late diagenetic phase as well as thirteen diagenetic types. According to the evidence of diagenetic division stages in combination with the data of basin burial-thermal evolution history and hydrocarbon charging history, the early diagenetic stage and the late diagenetic stage were recognized in Shahejie Formation of Qikou depression. The diagenesis of volcanic rocks has undergone three stages of dissolution, two stages of tectonism, two stages of hydrocarbon charging and chlorite cementation, siliceous cementation and carbonate cementation. The main diagenetic sequences are dissolution I→structure movement I→pectinate texture chlorite→fine fibrous chlorite →silicic I→coarse fibrous chlorite→hydrocarbon charging→silicic fillingⅡ→sparry calciteⅠ→tectonismⅡ →dissolutionⅡ→hydrocarbon chargingⅡ→sparry calciteⅡ→ferrocalcite→silicic filling Ⅲ→dissolution Ⅲ. Studies indicate that diagenesis has played dual functions of improving and destroying on the reservoir physical property. The diageneses which are constructive to the reservoirs are mainly volatile and escaping action, dissolution, condensation and contraction, diversification, mechanical compaction, weathering-leaching dissolution, and corrosion. The diageneses which are destructive to the reservoirs are mainly clinkering action and filing action, mechanical compaction and pressure solution, and cementation. |
| WANG Nai-jun,LUO Jing-lan,LIU Hua-qing,LI Shuang-wen,SHAO Hong-mei,GUO Yong-feng,YAO Jun.2012.Diagenesis of Volcanic Rocks in Shahejie Formation of Qikou Depression and Its Control over Reservoir Performance[J].Acta Geoscientica Sinica,33(3):360-370. |
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