鄂尔多斯盆地子洲地区下二叠统山西组二段地层水成因及气水分布规律研究
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摘要
本论文从山_2段砂体分布和储层特征入手;在应用不同产层判识标准对单井储层流体识别的基础上;以气水分布剖面为手段研究了工区的气水分布特征;分析得出了工区的气水分布规律和控制因素;结合地层水的水化学资料;预测了工区的气水分布,指出了有利勘探区块。主要取的了以下认识和成果:
1.山_2~3段底部砂体发育稳定,中上部砂体欠发育,在河道走向方向上砂体连通性好。山_2段储层集中在山_2~3段,孔隙度和渗透率低,属低孔低渗储层,孔隙类型以粒间孔、粒间溶孔为主,孔隙结构较好。储层以二类储层为主,三类储层也较发育,储层在层内和平面上表现出强烈的非均质性。
2.山_2~3段地层水为CaCl_2V型,属于地层古残留水。识别出了两类地层水:透镜体水、边(底)水。透镜体水矿化度低阳离子以Na~+为主;边(底)水矿化度高,阳离子以Ca~(2+)为主,两种地层水的成因不同。
3.构造特征和沉积相带展布控制了边(底)水的分布:西南倾的构造格局和南北向分叉展布的沉积相带,使的三支砂体南部、西南部构造低部位均存在边水区,各个边水区无统一的气水界面,气水界面从西到东相差接近300米。说明子洲山_2~3气藏并非一个统一的气藏,而是众多的相互独立的气水系统的集合。
4.储层特征和油气成藏过程控制了透镜体水的分布,储层早期致密化和强烈的非均质性,导致三、四类储层普遍发育。山_2~3段整体天然气充满度低、含水饱和度高。在气区内,三、四类储层的毛细管压力大,天然气驱替储层中地层水不完全或根部没有驱替出地层水,造成了地层水(透镜体水)在该段储层的富集。山_2~3段不存在气水“倒置”现象,属岩性或构造—岩性型气藏。
5.认为榆48井附近砂体厚、储层物性好,离气水界面远,是有利的勘探区,榆69井和榆29井周围气区范围小,勘探难度大。
The paper research Shan-2 members distribution of the sand-body and feature of reservoir. Based on the study of discrimination of single well pay zones and reservoir fluid;on the base of gas-water profile to study distribution characteristics of research area and find distribution law and controlling factors in research area;with data of hydrochemical water oformation water and forecast gas and water distribution.At the sanme tiime ,we point out favorable exploration targets. Results was:
1. At the bottom of Shan-2 members of sandbody steady,middle-head of sandbody don't steady and connectivity sandbody along river channel was well. Shan-2 members reservoir is belong to low porosity and permeability; pore types main intergranular pore and intergranular dissolved pores and the pore structure was well. reservoir were mainly composed of type II ,type III were development. Reservoir conduct intensely leterogeneity in. plane and internal.
2. Shan-2 members formation water is type V of CaCl_2 and is belong to residual waterr in formation.we identify two type of formation :water in lenticular、edge and bottom water. Degree of mineralization of water in lenticular is lower and main cation is Na~+; degree of mineralization edge and bottom water is high and main cation is Ca~(2+),two type of formation water have different factor.
3. Distribution of edge (bottom) water was controled structure and sedimentary facies characteristics; SW inclined structure and sedimentary facies Tract in NS,so south and southwest of three sandbody lower location of the structure being edge and bottom water.While per area is not unite gas/water surface and gas/water surface differed 300m from west to east.The appearance illustrate:Zi-Zhou gas pol of Shan-2 members is not a unite and it is combined by many independence gas pol.
4. Distribution of lenticular wate was contrled by reservoir characteristics and process of hydrocarbon accumulation. Because early diagenetic stage of tightening and heterogeneity,being of a low gas filling and high water saturation in Shan-2 members.In gas area, capillary pressure of type III、IV is high and gas displace formation water incompletely or don't displace formation water.The appearance result formation water(water in lenticular) enrichment in Shan-2 members. Shan-2 members absent water over gas phenomenon and the type of gas pool is belong to structure-lithostratigraphic gas reservoirs.
5. Research result demonstrate::thicker sandbody、well reservoir properties、far away gas/water surface near yu 48 is the advantageous exploration area; gas area range of yu 69 and yu 29 was small and oil-gas exploration is hard.
1.山_2~3段底部砂体发育稳定,中上部砂体欠发育,在河道走向方向上砂体连通性好。山_2段储层集中在山_2~3段,孔隙度和渗透率低,属低孔低渗储层,孔隙类型以粒间孔、粒间溶孔为主,孔隙结构较好。储层以二类储层为主,三类储层也较发育,储层在层内和平面上表现出强烈的非均质性。
2.山_2~3段地层水为CaCl_2V型,属于地层古残留水。识别出了两类地层水:透镜体水、边(底)水。透镜体水矿化度低阳离子以Na~+为主;边(底)水矿化度高,阳离子以Ca~(2+)为主,两种地层水的成因不同。
3.构造特征和沉积相带展布控制了边(底)水的分布:西南倾的构造格局和南北向分叉展布的沉积相带,使的三支砂体南部、西南部构造低部位均存在边水区,各个边水区无统一的气水界面,气水界面从西到东相差接近300米。说明子洲山_2~3气藏并非一个统一的气藏,而是众多的相互独立的气水系统的集合。
4.储层特征和油气成藏过程控制了透镜体水的分布,储层早期致密化和强烈的非均质性,导致三、四类储层普遍发育。山_2~3段整体天然气充满度低、含水饱和度高。在气区内,三、四类储层的毛细管压力大,天然气驱替储层中地层水不完全或根部没有驱替出地层水,造成了地层水(透镜体水)在该段储层的富集。山_2~3段不存在气水“倒置”现象,属岩性或构造—岩性型气藏。
5.认为榆48井附近砂体厚、储层物性好,离气水界面远,是有利的勘探区,榆69井和榆29井周围气区范围小,勘探难度大。
The paper research Shan-2 members distribution of the sand-body and feature of reservoir. Based on the study of discrimination of single well pay zones and reservoir fluid;on the base of gas-water profile to study distribution characteristics of research area and find distribution law and controlling factors in research area;with data of hydrochemical water oformation water and forecast gas and water distribution.At the sanme tiime ,we point out favorable exploration targets. Results was:
1. At the bottom of Shan-2 members of sandbody steady,middle-head of sandbody don't steady and connectivity sandbody along river channel was well. Shan-2 members reservoir is belong to low porosity and permeability; pore types main intergranular pore and intergranular dissolved pores and the pore structure was well. reservoir were mainly composed of type II ,type III were development. Reservoir conduct intensely leterogeneity in. plane and internal.
2. Shan-2 members formation water is type V of CaCl_2 and is belong to residual waterr in formation.we identify two type of formation :water in lenticular、edge and bottom water. Degree of mineralization of water in lenticular is lower and main cation is Na~+; degree of mineralization edge and bottom water is high and main cation is Ca~(2+),two type of formation water have different factor.
3. Distribution of edge (bottom) water was controled structure and sedimentary facies characteristics; SW inclined structure and sedimentary facies Tract in NS,so south and southwest of three sandbody lower location of the structure being edge and bottom water.While per area is not unite gas/water surface and gas/water surface differed 300m from west to east.The appearance illustrate:Zi-Zhou gas pol of Shan-2 members is not a unite and it is combined by many independence gas pol.
4. Distribution of lenticular wate was contrled by reservoir characteristics and process of hydrocarbon accumulation. Because early diagenetic stage of tightening and heterogeneity,being of a low gas filling and high water saturation in Shan-2 members.In gas area, capillary pressure of type III、IV is high and gas displace formation water incompletely or don't displace formation water.The appearance result formation water(water in lenticular) enrichment in Shan-2 members. Shan-2 members absent water over gas phenomenon and the type of gas pool is belong to structure-lithostratigraphic gas reservoirs.
5. Research result demonstrate::thicker sandbody、well reservoir properties、far away gas/water surface near yu 48 is the advantageous exploration area; gas area range of yu 69 and yu 29 was small and oil-gas exploration is hard.
引文
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