準噶爾盆地瑪湖凹陷西斜坡南部區(qū)域三疊系百口泉組沉積與層序地層特征研究
發(fā)布時間：2018-08-04 11:28
【摘要】：瑪湖凹陷西斜坡區(qū)位于瑪湖凹陷西北部,東靠達巴松凸起與夏鹽凸起,北臨烏夏斷裂帶,南接中拐凸起,西抵克百斷裂帶,整體上是中央凹陷次一級東南傾斜的單一構造,論文重點研究和討論的目的層是三疊系百口泉組地層。本文以巖性、粒度、測井、沉積特征作為參數(shù),對研究區(qū)沉積相進行劃分,該區(qū)總體發(fā)育扇三角洲和湖泊2種沉積相。扇三角洲沉積可以進一步劃分為扇三角洲平原和扇三角洲前緣2種亞相。其中,扇三角洲平原亞相以辮狀河道沉積微相為主;扇三角洲前緣亞相以水下分流河道沉積微相為主。湖泊相沉積可以分為濱湖和淺湖2種亞相,但因為濱湖亞相和淺湖亞相沒有明顯的區(qū)別特征,所以整體作為濱-淺湖亞相分析,濱淺湖亞相進一步可以劃分為濱淺湖泥1種沉積微相。本文根據(jù)該區(qū)勘探現(xiàn)狀,以層序地層學作為指導理論,運用沉積學、測井地層學、地震地層學原理,以地震反射、測井特征、巖芯和地質露頭中的地層剝蝕、上超、沉積相突變等作為依據(jù),對該區(qū)層序地層進行研究,發(fā)現(xiàn)該區(qū)整體發(fā)育5個以沉積旋回作為分界面的三級層序。目的層百口泉組地層整體為一個三級層序,再根據(jù)巖性和電性特征在垂直方向的變化,目的層進一步可以劃分為三個四級層序,分別對應百一段,百二段和百三段。以百口泉組地層內部三段所對應的三個四級旋回作為單元,制作這三個四級層序中沉積相的平面分布圖,研究各四級層序中沉積相的演化規(guī)律和分布特征,為預測該區(qū)有利儲層相帶的平面分布特征提供依據(jù)。研究區(qū)百口泉組儲層孔隙度和滲透率值較低,其中孔隙度大小在5.0%～14.5%之間,平均值為8.45%;滲透率大小在0.04mD～96.50mD之間,平均值為2.10mD,整體上屬于特低孔-滲儲層,主要分布在百一段和百二段中的扇三角洲前緣亞相中,巖性以巖屑砂礫巖和長石砂礫巖為主。儲集空間類型多樣,有剩余粒間孔、粒內溶孔、粒間溶孔、收縮孔和微裂縫5種,主要以剩余粒間孔和粒內溶孔為主。這是由于儲層巖石中存在的剛性顆粒具有一定的抗壓實作用,對一部分原生粒間孔的保存提供了有利條件;另一方面,儲層巖石中存在大量的長石且早期油氣充注和地層異常高壓的共同作用下,地層中發(fā)育了大量的粒內溶孔。在整體特低孔-滲儲層的基礎上,根據(jù)泥質含量、物性特征、排驅壓力、喉道半徑、粒度特征,研究區(qū)儲層分為2種儲層。1種為較好的儲層,主要分布在百一段,巖性以細粒砂質礫巖、礫巖及含礫粗砂巖為主,物性和喉道結構相對都比較好;另一種為較差儲層,主要分布在百二段,巖性以砂質細礫巖為主,物性中等,喉道結構較差。而百三段,基本為致密泥巖層,不具備儲層條件,可以作為良好的蓋層,為百口泉組油藏的形成提供有利條件。綜合分析沉積、層序地層和儲層特征,認為瑪湖凹陷西斜坡南部區(qū)域百口泉組有利儲層分布在百一段和百二段地層中。百一段中,研究區(qū)整體為有利儲層帶集中分布在扇三角洲前緣亞相中;百二段中,有利儲層分布在研究區(qū)北部,集中分布在北部扇三角洲前緣亞相和西北部平原亞相沉積中。
[Abstract]:The western slope area of the Ma Hu sag is located in the northwest of the Ma Hu sag, the east of the dabasone uplift and the Xia salt uplift, the north facing the wuxia fault zone, the South connection in the middle abduction uplift and the West offset fault zone, on the whole the single structure of the south-east slope of the central depression at the secondary level. The main research and discussion of the paper is the Triassic hundred mouth spring formation. This paper is based on lithology, The grain size, logging and sedimentary features are divided into 2 sedimentary facies of the fan delta and lake in this area. Fan delta deposits can be further divided into 2 subfacies of fan delta plain and fan delta front, of which the fan delta plain subfacies is dominated by braided channel sedimentary microfacies; The predominant subfacies are mainly subaqueous distributary channel sedimentary microfacies. The lacustrine facies can be divided into 2 subfacies of Binhu and shallow lakes, but because the Binhu subfacies and shallow lake subfacies have no distinct distinguishing features, the whole as the coastal shallow lake subfacies analysis, the shore shallow lake subfacies can be further divided into 1 sedimentary microfacies of the shore shallow lake mud. By using sequence stratigraphy as a guiding theory, using the principles of sedimentology, logging stratigraphy and seismic stratigraphy, based on seismic reflection, logging features, core and geological outcrop formation erosion, supra, sedimentary facies mutation and so on, the sequence stratigraphy of this area was studied, and 5 sedimentary cycles were found to be the interface of the region as a whole. The three order sequence of the target layer is a three order sequence in the bakou Quan formation, and then according to the vertical changes in the lithologic and electrical characteristics. The target layer can be further divided into three four order sequences, respectively, corresponding to the hundred first, the second and the hundred third segments, and three four stage cycles corresponding to the three segments of the inner part of the bakou spring formation. The plane distribution map of the sedimentary facies in these three four sequence sequences is made to study the evolution law and distribution characteristics of sedimentary facies in each four order sequence, which provides a basis for predicting the plane distribution characteristics of the favorable reservoir facies belt in this area. The porosity and permeability of the reservoir in the study area are low, the size of the porosity is between 5% and 14.5%, and the average value of the reservoir is between them. The permeability is 8.45%. The permeability is between 0.04mD and 96.50mD, with an average value of 2.10mD, which belongs to the ultra low porosity and permeability reservoir, mainly in the fan delta front subfacies in the first and second segments. The lithology is dominated by lithic sand conglomerate and feldspar conglomerate, with many types of reservoir space, residual intergranular pores, intergranular pore solution, intergranular pore solution and contraction. There are 5 kinds of pores and micro cracks, mainly due to the remaining intergranular pores and intragranular holes. This is because the rigid particles in the reservoir rocks have certain anti compaction effects and provide favorable conditions for the preservation of a part of the primary intergranular pores; on the other hand, there are a large number of feldspar in the reservoir rocks and the early oil gas filling and abnormal high pressure in the formation. Under the common action, a large number of intragranular holes are developed in the formation. On the basis of the overall low porosity and permeability reservoir, according to the shale content, physical properties, displacement pressure, throat radius and grain size, the reservoir is divided into 2 kinds of reservoir.1, mainly distributed in the first one, and the lithology is fine-grained sandy conglomerate, conglomerate and gravel coarse sand. The rock is relatively good; the other is relatively poor in physical and laryngeal structure, and the other is a poor reservoir, mainly distributed in the second section. The lithology is mainly sandy conglomerate, with medium physical property and poor structure of the larynx. Comprehensive analysis of sedimentary, sequence stratigraphy and reservoir characteristics suggests that the favorable reservoirs in the southern part of the western slope of the western slope of the Ma Hu depression are distributed in the first and the second strata of the 100 section. In the first part of the study area, the favorable reservoir zones are centrally distributed in the fan delta front subfacies, and the favorable reservoirs are distributed in the northern part of the study area and concentrated in the northern part of the study area. It is distributed in the northern fan delta front subfacies and the northwest plains subfacies.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P539.2;P534.51
[Abstract]:The western slope area of the Ma Hu sag is located in the northwest of the Ma Hu sag, the east of the dabasone uplift and the Xia salt uplift, the north facing the wuxia fault zone, the South connection in the middle abduction uplift and the West offset fault zone, on the whole the single structure of the south-east slope of the central depression at the secondary level. The main research and discussion of the paper is the Triassic hundred mouth spring formation. This paper is based on lithology, The grain size, logging and sedimentary features are divided into 2 sedimentary facies of the fan delta and lake in this area. Fan delta deposits can be further divided into 2 subfacies of fan delta plain and fan delta front, of which the fan delta plain subfacies is dominated by braided channel sedimentary microfacies; The predominant subfacies are mainly subaqueous distributary channel sedimentary microfacies. The lacustrine facies can be divided into 2 subfacies of Binhu and shallow lakes, but because the Binhu subfacies and shallow lake subfacies have no distinct distinguishing features, the whole as the coastal shallow lake subfacies analysis, the shore shallow lake subfacies can be further divided into 1 sedimentary microfacies of the shore shallow lake mud. By using sequence stratigraphy as a guiding theory, using the principles of sedimentology, logging stratigraphy and seismic stratigraphy, based on seismic reflection, logging features, core and geological outcrop formation erosion, supra, sedimentary facies mutation and so on, the sequence stratigraphy of this area was studied, and 5 sedimentary cycles were found to be the interface of the region as a whole. The three order sequence of the target layer is a three order sequence in the bakou Quan formation, and then according to the vertical changes in the lithologic and electrical characteristics. The target layer can be further divided into three four order sequences, respectively, corresponding to the hundred first, the second and the hundred third segments, and three four stage cycles corresponding to the three segments of the inner part of the bakou spring formation. The plane distribution map of the sedimentary facies in these three four sequence sequences is made to study the evolution law and distribution characteristics of sedimentary facies in each four order sequence, which provides a basis for predicting the plane distribution characteristics of the favorable reservoir facies belt in this area. The porosity and permeability of the reservoir in the study area are low, the size of the porosity is between 5% and 14.5%, and the average value of the reservoir is between them. The permeability is 8.45%. The permeability is between 0.04mD and 96.50mD, with an average value of 2.10mD, which belongs to the ultra low porosity and permeability reservoir, mainly in the fan delta front subfacies in the first and second segments. The lithology is dominated by lithic sand conglomerate and feldspar conglomerate, with many types of reservoir space, residual intergranular pores, intergranular pore solution, intergranular pore solution and contraction. There are 5 kinds of pores and micro cracks, mainly due to the remaining intergranular pores and intragranular holes. This is because the rigid particles in the reservoir rocks have certain anti compaction effects and provide favorable conditions for the preservation of a part of the primary intergranular pores; on the other hand, there are a large number of feldspar in the reservoir rocks and the early oil gas filling and abnormal high pressure in the formation. Under the common action, a large number of intragranular holes are developed in the formation. On the basis of the overall low porosity and permeability reservoir, according to the shale content, physical properties, displacement pressure, throat radius and grain size, the reservoir is divided into 2 kinds of reservoir.1, mainly distributed in the first one, and the lithology is fine-grained sandy conglomerate, conglomerate and gravel coarse sand. The rock is relatively good; the other is relatively poor in physical and laryngeal structure, and the other is a poor reservoir, mainly distributed in the second section. The lithology is mainly sandy conglomerate, with medium physical property and poor structure of the larynx. Comprehensive analysis of sedimentary, sequence stratigraphy and reservoir characteristics suggests that the favorable reservoirs in the southern part of the western slope of the western slope of the Ma Hu depression are distributed in the first and the second strata of the 100 section. In the first part of the study area, the favorable reservoir zones are centrally distributed in the fan delta front subfacies, and the favorable reservoirs are distributed in the northern part of the study area and concentrated in the northern part of the study area. It is distributed in the northern fan delta front subfacies and the northwest plains subfacies.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P539.2;P534.51
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