石臼坨凸起中段明化鎮(zhèn)組極淺水三角洲特征及構(gòu)造耦合分析
發(fā)布時間：2018-09-07 13:38
【摘要】：石臼坨凸起是渤海海域最有利的含油氣聚集區(qū)之一。90年代石臼坨凸起古近系Q32-6等大型油氣田的發(fā)現(xiàn),揭開了石臼坨凸起淺層巖性油氣藏勘探的序幕。隨著2011年研究區(qū)勘探發(fā)現(xiàn)Q33-2、Q33-3構(gòu)造-巖性油氣藏,三級地質(zhì)儲量合計約4900萬方,進一步證實了該區(qū)構(gòu)造-巖性油氣藏具有較好的勘探潛力,目前該區(qū)淺層明化鎮(zhèn)組還有多個未鉆有利構(gòu)造-巖性目標,石油的潛在資源量達到1億多方。本論文以現(xiàn)代石油地質(zhì)學、高精度層序地層學以及構(gòu)造地質(zhì)學等理論方法為指導,地質(zhì)-地球物理方法結(jié)合,對渤海灣石臼坨凸起中段新近系明化鎮(zhèn)組下段開展層序—沉積體系綜合分析,總結(jié)了各層序單元砂體展布與構(gòu)造的耦合關(guān)系。取得以下主要成果及進展:在井-震層序界面識別基礎(chǔ)上,利用準層序的結(jié)構(gòu)、地震剖面上進積退積的轉(zhuǎn)變以及上超面和加積面轉(zhuǎn)變等層序疊加樣式進行明下段坳陷型湖盆的層序劃分,結(jié)合干濕度古生物曲線和GR曲線和fischer圖版確定湖平面的變化,通過巖心觀察、測井相分析以及古生物分析,粒度分析和薄片鑒定等方法,在界面識別的劃分基礎(chǔ)上,綜合考慮了旋回地層學和經(jīng)典的層序地層學,將石臼坨凸起明下段劃分為一個三級層序,三個體系域,五個四級層序。在層序格架內(nèi),通過所用分析資料以及巖石的剖面組合、沉積構(gòu)造、古生物特征等,判定明下段整體為極淺水三角洲沉積,存在兩種相模式:分別為枝狀分支河道型極淺水三角洲沉積模式和朵狀分流砂壩型極淺水三角洲沉積模式。并在三角洲平原中劃分出水上平原和水下平原。其中低位域時期著重發(fā)展極淺水三角洲前緣水下分流河道,砂體展布方位為北西—南東,在北西—南東方向較連續(xù)。而晚期高位體系域時期,受沉積作用的影響,古地貌為南西高北東低,物源主要來自南西方向,由南西方向至北東方向,沉積相帶由極淺水三角洲平原逐步過渡至極淺水三角洲前緣,砂體展布方位是南西—北東方向,于南西—北東方向較為連續(xù)。最后,通過砂體展布和斷裂活動的耦合分析,在宏觀的物源分析基礎(chǔ)上建立了淺水三角洲的預(yù)測模式,在模式指導下結(jié)合地球物理屬性,綜合預(yù)測了各層序內(nèi)砂體的展布,并在此基礎(chǔ)上,總結(jié)了構(gòu)造對地貌、層序、砂體的控制作用。
[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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13
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