石臼坨凸起中段明化镇组极浅水三角洲特征及构造耦合分析
发布时间：2018-09-07 13:38
【摘要】：石臼坨凸起是渤海海域最有利的含油气聚集区之一。90年代石臼坨凸起古近系Q32-6等大型油气田的发现,揭开了石臼坨凸起浅层岩性油气藏勘探的序幕。随着2011年研究区勘探发现Q33-2、Q33-3构造-岩性油气藏,三级地质储量合计约4900万方,进一步证实了该区构造-岩性油气藏具有较好的勘探潜力,目前该区浅层明化镇组还有多个未钻有利构造-岩性目标,石油的潜在资源量达到1亿多方。本论文以现代石油地质学、高精度层序地层学以及构造地质学等理论方法为指导,地质-地球物理方法结合,对渤海湾石臼坨凸起中段新近系明化镇组下段开展层序—沉积体系综合分析,总结了各层序单元砂体展布与构造的耦合关系。取得以下主要成果及进展:在井-震层序界面识别基础上,利用准层序的结构、地震剖面上进积退积的转变以及上超面和加积面转变等层序叠加样式进行明下段坳陷型湖盆的层序划分,结合干湿度古生物曲线和GR曲线和fischer图版确定湖平面的变化,通过岩心观察、测井相分析以及古生物分析,粒度分析和薄片鉴定等方法,在界面识别的划分基础上,综合考虑了旋回地层学和经典的层序地层学,将石臼坨凸起明下段划分为一个三级层序,三个体系域,五个四级层序。在层序格架内,通过所用分析资料以及岩石的剖面组合、沉积构造、古生物特征等,判定明下段整体为极浅水三角洲沉积,存在两种相模式:分别为枝状分支河道型极浅水三角洲沉积模式和朵状分流砂坝型极浅水三角洲沉积模式。并在三角洲平原中划分出水上平原和水下平原。其中低位域时期着重发展极浅水三角洲前缘水下分流河道,砂体展布方位为北西—南东,在北西—南东方向较连续。而晚期高位体系域时期,受沉积作用的影响,古地貌为南西高北东低,物源主要来自南西方向,由南西方向至北东方向,沉积相带由极浅水三角洲平原逐步过渡至极浅水三角洲前缘,砂体展布方位是南西—北东方向,于南西—北东方向较为连续。最后,通过砂体展布和断裂活动的耦合分析,在宏观的物源分析基础上建立了浅水三角洲的预测模式,在模式指导下结合地球物理属性,综合预测了各层序内砂体的展布,并在此基础上,总结了构造对地貌、层序、砂体的控制作用。
[Abstract]:The discovery of large oil and gas fields such as Q32-6 in Paleogene of Shiyutuo uplift in the 1990s, which is one of the most favorable oil-gas accumulation areas in Bohai Sea, has opened the prologue of exploration for shallow lithologic reservoirs in Shiyutuo uplift. With the discovery of Q33-2Q33-3 tectonic-lithologic reservoirs in the study area in 2011, the third grade geological reserves total about 4900 million square meters, which further proves that the tectonic-lithologic reservoirs in this area have good exploration potential. At present, there are many favorable tectonic-lithologic targets in the shallow Minghuazhen formation, and the potential oil resources amount to more than 100 million. This paper is guided by modern petroleum geology, high-precision sequence stratigraphy and tectonic geology. A comprehensive analysis of the sequence sedimentary system of the lower member of the Neogene Minghuazhen formation in the middle part of the Shiyutuo uplift in Bohai Bay is made, and the coupling relationship between the distribution of sand bodies in each sequence unit and the structure is summarized. The main achievements and progress are as follows: based on the recognition of the well-seismic sequence interface, the structure of the quasi-sequence is used. The transformation of progradation and retrogradation on seismic profile and sequence superposition style of upper superplane and accretion surface are used to divide the sequence of depression lacustrine basin in the lower part of the Ming Dynasty. The changes of lake plane are determined by combining the dryness and humidity paleontology curve, GR curve and fischer chart. Based on core observation, well logging facies analysis, paleontology analysis, particle size analysis and slice identification, cyclic stratigraphy and classical sequence stratigraphy are considered. The lower member of Shiyutuo uplift is divided into a third order sequence, three system tracts and five fourth order sequences. In the sequence framework, it is determined that the lower part of the Ming formation is a very shallow deltaic deposit by using the analysis data and the rock profile combination, sedimentary structure, paleobiological characteristics, etc. There are two types of facies models: the branched channel type very shallow water delta sedimentary model and the flower distributary sand dam type very shallow water delta sedimentary model. And the delta plain is divided into water plain and underwater plain. In the low position region, the underwater distributary channel in the front edge of the very shallow water delta is mainly developed. The distribution orientation of the sand body is from the north west to the south east, and the direction of the sand body is relatively continuous in the north west to south east direction. During the late stage of high system tracts, the paleomorphology was influenced by sedimentation. The paleogeomorphology was mainly from the south to the west, from the south to the east, from the south to the west, from the north to the east. The sedimentary facies zone is gradually transitioning from the very shallow delta plain to the very shallow delta front. The direction of sand body distribution is from the south west to the north east, and from south west to north east. Finally, through the coupling analysis of sand body distribution and fault activity, the prediction model of shallow water delta is established on the basis of macroscopic material source analysis. Under the guidance of the model, the distribution of sand bodies in each sequence is comprehensively predicted by combining geophysical properties. On this basis, the controlling effect of structure on geomorphology, sequence and sand body is summarized.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
[Abstract]:The discovery of large oil and gas fields such as Q32-6 in Paleogene of Shiyutuo uplift in the 1990s, which is one of the most favorable oil-gas accumulation areas in Bohai Sea, has opened the prologue of exploration for shallow lithologic reservoirs in Shiyutuo uplift. With the discovery of Q33-2Q33-3 tectonic-lithologic reservoirs in the study area in 2011, the third grade geological reserves total about 4900 million square meters, which further proves that the tectonic-lithologic reservoirs in this area have good exploration potential. At present, there are many favorable tectonic-lithologic targets in the shallow Minghuazhen formation, and the potential oil resources amount to more than 100 million. This paper is guided by modern petroleum geology, high-precision sequence stratigraphy and tectonic geology. A comprehensive analysis of the sequence sedimentary system of the lower member of the Neogene Minghuazhen formation in the middle part of the Shiyutuo uplift in Bohai Bay is made, and the coupling relationship between the distribution of sand bodies in each sequence unit and the structure is summarized. The main achievements and progress are as follows: based on the recognition of the well-seismic sequence interface, the structure of the quasi-sequence is used. The transformation of progradation and retrogradation on seismic profile and sequence superposition style of upper superplane and accretion surface are used to divide the sequence of depression lacustrine basin in the lower part of the Ming Dynasty. The changes of lake plane are determined by combining the dryness and humidity paleontology curve, GR curve and fischer chart. Based on core observation, well logging facies analysis, paleontology analysis, particle size analysis and slice identification, cyclic stratigraphy and classical sequence stratigraphy are considered. The lower member of Shiyutuo uplift is divided into a third order sequence, three system tracts and five fourth order sequences. In the sequence framework, it is determined that the lower part of the Ming formation is a very shallow deltaic deposit by using the analysis data and the rock profile combination, sedimentary structure, paleobiological characteristics, etc. There are two types of facies models: the branched channel type very shallow water delta sedimentary model and the flower distributary sand dam type very shallow water delta sedimentary model. And the delta plain is divided into water plain and underwater plain. In the low position region, the underwater distributary channel in the front edge of the very shallow water delta is mainly developed. The distribution orientation of the sand body is from the north west to the south east, and the direction of the sand body is relatively continuous in the north west to south east direction. During the late stage of high system tracts, the paleomorphology was influenced by sedimentation. The paleogeomorphology was mainly from the south to the west, from the south to the east, from the south to the west, from the north to the east. The sedimentary facies zone is gradually transitioning from the very shallow delta plain to the very shallow delta front. The direction of sand body distribution is from the south west to the north east, and from south west to north east. Finally, through the coupling analysis of sand body distribution and fault activity, the prediction model of shallow water delta is established on the basis of macroscopic material source analysis. Under the guidance of the model, the distribution of sand bodies in each sequence is comprehensively predicted by combining geophysical properties. On this basis, the controlling effect of structure on geomorphology, sequence and sand body is summarized.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
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