肇州凹陷沙河子组源岩预测及资源潜力评价

发布时间：2018-07-05 05:36

本文选题：源岩 + 生烃潜力　；参考：《东北石油大学》2015年硕士论文

【摘要】：肇州凹陷沙河子组沉积地层作为松辽盆地断陷期的产物,前人从烃源岩的角度对其进行研究还不够详细,伴着探索深度的加大和许多新现象的发现,虽然对形成演化断陷地层的构造特征进行了重新认识,但沙河子组研究尚未有新的认识和进步,这也限制了资源量的确切落实和深层天然气勘探的突破实施,因此亟待从沙河子组源岩品质、生烃潜力等方面进行深入研究,为搜索新的勘探领域和重新审视盆地油气资源和富集规律提供条件。利用钻井、测井和地震资料等,开展对肇州凹陷沙河子组的源岩发育与分布和地化特征研究,并认为肇州凹陷沙河子组整体为一个二级层序,由下至上划分为SQ1、SQ2、SQ3和SQ4共四个三级层序(柳成志,2012),结合地史、热史及化学动力学等方法评价了沙河子组天然气生烃潜力及资源潜力。结果表明,肇州凹陷沙河子组泥岩发育广泛,平均厚度140米左右,其中凹陷北部湖盆中心整体较厚,南部以肇深14井及肇深15井为中心的泥岩厚度为最大。肇州凹陷沙河子组TOC整体较高,半数以上达到好的级别,尤以SQ2段与SQ3段更为突出;有机质类型以III型为主,兼有少量II1型,有利于大量生气;成熟度平均值2.41%,70%以上进入过成熟阶段,大都进入高成熟-过成熟阶段。SQ2段与SQ3段生气量最多,分别达到12170.6×108m3与12497.5×108m3,SQ1段与SQ4段分别为2715.1×108m3和960×108m3。综合选取不同的运聚系数,计算得肇州凹陷沙河子组天然气资源潜力为283.43—1417.15亿立方米。总体看来,肇州凹陷沙河子组总生气量为4.68×1012m3,具有较高资源潜力,为肇州凹陷沙河子组的继续勘探开发打下良好基础。
[Abstract]:The sedimentary strata of Shahezi formation in Zhaozhou sag, as the product of Songliao basin fault period, have not been studied in detail from the angle of source rock, accompanied by the increase of exploration depth and the discovery of many new phenomena. Although the structural characteristics of the formation and evolution of faulted strata have been reunderstood, there has not been any new understanding and progress in the study of the Shahezi formation, which has also restricted the exact implementation of the amount of resources and the implementation of the breakthrough in deep gas exploration. Therefore, it is urgent to study the source rock quality and hydrocarbon generation potential of Shahezi formation in order to search for new exploration fields and to re-examine the oil and gas resources and enrichment rules in the basin. Based on drilling, logging and seismic data, the source rock development, distribution and geochemical characteristics of Shahezi formation in Zhaozhou sag are studied, and it is considered that Shahezi formation in Zhaozhou sag is a second-order sequence. The natural gas hydrocarbon generation potential and resource potential of Shahezi formation are evaluated by four third-order sequences (Liu Chengzhi 2012) from the bottom up to SQ1, SQ2SQ3 and SQ4. The hydrocarbon generation potential and resource potential of natural gas in Shahezi formation are evaluated by means of geo-history, thermal history and chemical kinetics. The results show that the mudstone of Shahezi formation in Zhaozhou sag is widely developed with an average thickness of about 140 meters, in which the center of the lake basin in the north of the sag is thicker as a whole, and the mudstone thickness in the south of Shahezi formation with Zhaoshen 14 well and Zhaoshen 15 well as the center is the largest. The TOC of Shahezi formation in Zhaozhou sag is relatively high as a whole, more than half of which reach a good grade, especially in SQ2 and SQ3, the organic matter type is mainly type III, with a small amount of type II1, which is beneficial to a large amount of gas generation. The average maturity of 2.41% and over 70% entered the over-mature stage, most of them reached the high mature-over-maturation stage. SQ2 and SQ3 were the most abundant, reaching 12170.6 脳 108m3 and 12497.5 脳 108m3SQ1 and SQ4, respectively, which were 2715.1 脳 108m3 and 960 脳 108m3, respectively. The potential of natural gas resources of Shahezi formation in Zhaozhou sag is 283.43-141.75 billion cubic meters. In general, the total gas generation of Shahezi formation in Zhaozhou sag is 4.68 脳 1012m3, which has a high resource potential and lays a good foundation for further exploration and development of Shahezi formation in Zhaozhou sag.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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