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Relationship between heterogeneity of source rocks and genetic mechanism of abnormally high pressure

Science China Earth Sciences 2013年第3期56卷 1971-1976页

作者： ZHANG XueJun XU XingYou WANG YongShi SONG GuoQi GUO ChunQing LIU Qing LI Ping Guangzhou Institute of Geochemistry Chinese Academy of Sciences Geological Scientific Research Institute of Shengli Oilfield SinoPec

Based on the micro-fluorescence observation of polished sections of source rocks,two types of micro-layers with different wetting properties formed in thermal evolution,i.e.,oil-wetting and water-wetting micro-layers,are *** wetting property is found closely related to the abundance of organic matter and its occurrences with inorganic *** alternating distribution and intercrossing of two types of micro-layers formed many separated spaces with different *** strong capillary forces in these separated spaces with different wettibilities obstruct the cross flows of pore fluids and result in nearly independent and closed fluid *** a consequence,these spatially superposed spaces in source rocks bear the overburden pressure and then abnormally high pressures have developed in the whole source rock ***,the abundance and occurrences of organic matter are the main inner factors influencing the formation of abnormally high pressures,whereas the formation,distribution and development of micro-layers with different wettabilities during the evolution of source rock determine the intensity and spatial distribution of abnormally high pressures.

关键词： source rock heterogeneity abnormally high pressure genetic mechanism wettability

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Characteristics,origin and controlling effects on hydrocarbon accumulation of overpressure in foreland thrust belt of southern margin of Junggar Basin,NW China

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Petroleum Exploration and Development 2022年第5期49卷 991-1003页

作者： LU Xuesong ZHAO Mengjun ZHANG Fengqi GUI Lili LIU Gang ZHUO Qingong CHEN Zhuxin Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Key Laboratory of Basin Structure and Hydrocarbon Accumulation CNPCBeijing 100083China School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065China

Aiming at the differential distribution of overpressure in vertical and lateral directions in the foreland thrust belt in the southern margin of Junggar Basin,the study on overpressure origin identification and overpressure evolution simulation is carried *** on the measured formation pressure,drilling fluid density and well logging data,overpressure origin identification and overpressure evolution simulation techniques are used to analyze the vertical and lateral distribution patterns of overpressure,genetic mechanisms of overpressure in different structural belts and causes of the differential distribution of overpressure,and the controlling effects of overpressure development and evolution on the formation and distribution of oil and gas *** research shows that overpressure occurs in multiple formations vertically in the southern Junggar foreland thrust belt,the deeper the formation,the bigger the scale of the overpressure ***,overpressure is least developed in the mountain front belt,most developed in the fold anticline belt,and relatively developed in the slope *** differential distribution of overpressure is mainly controlled by the differences in disequilibrium compaction and tectonic compression strengths of different *** vertical overpressure transmission caused by faults connecting the deep overpressured system has an important contribution to the further increase of the overpressure strength in this *** controlling effect of overpressure development and evolution on hydrocarbon accumulation and distribution shows in the following aspects:When the strong overpressure was formed before reservoir becoming tight overpressure maintains the physical properties of deep reservoirs to some extent,expanding the exploration depth of deep reservoirs;reservoirs below the overpressured mudstone cap rocks of the Paleogene Anjihaihe Formation and Lower Cretaceous Tugulu Group are main sites for oil and gas accumulation;under the

关键词： abnormally high pressure overpressure origin tectonic compression overpressure transmission hydrocarbon accumulation foreland thrust belt Junggar Basin

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