石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2015年
1期
7-16
,共10页
张雷%朱伦葳%卢双舫%张学娟%申家年%王雅春
張雷%硃倫葳%盧雙舫%張學娟%申傢年%王雅春
장뢰%주륜위%로쌍방%장학연%신가년%왕아춘
火山岩%封盖能力%盖层%天然气藏%徐家围子断陷%松辽盆地
火山巖%封蓋能力%蓋層%天然氣藏%徐傢圍子斷陷%鬆遼盆地
화산암%봉개능력%개층%천연기장%서가위자단함%송료분지
volcanic rock%sealing ability%cap rock%gas reservoir%Xujiaweizi fault-depression%Songliao Basin
通过分析松辽盆地徐家围子断陷营城组火山岩气藏上覆岩层的岩性、物性、空间位置及厚度等差异分布规律，确定了火山岩天然气盖层的类型及划分标准，探讨了各类型盖层的空间分布规律、天然气封闭性及其对气藏发育控制作用的差异性。分析结果表明，徐家围子断陷营城组火山岩天然气藏盖层具有3种类型：Ⅰ型为顶部泥岩盖层，Ⅱ型为顶部致密火山岩盖层，Ⅲ型为上部致密火山岩夹层盖层。其中，Ⅱ型和Ⅲ型盖层岩性均含有火山熔岩及火山碎屑岩两类岩性，且伽马及密度测井曲线都显示高值特征；二者测井响应主要区别在于空间分布位置上的差异，Ⅱ型盖层位于火山岩顶部，而Ⅲ型盖层则位于火山岩段上部，其上还覆盖低密度火山岩段。Ⅱ型盖层覆盖面积大，空间连续性好，排替压力最大可达8.8 MPa，相同盖层厚度条件下所对应单井日产气量最高，可达36.6×104 m3；Ⅰ型盖层覆盖面积次之，且主要发育在断陷边部地区，排替压力最大为6.9 MPa，覆盖范围内单井日产气量最高为23.2×104 m3；而Ⅲ型盖层分布区域内致密封盖层之间空间连续性较差，盖层排替压力大部分在4.75 MPa以内，单井日产气量最高仅为12.8×104 m3。Ⅱ型盖层对天然气具有更强的封盖作用，Ⅰ型盖层次之，Ⅲ型盖层封盖能力最差。各类型盖层封盖能力的差异性控制着火山岩气藏的形成与富集。
通過分析鬆遼盆地徐傢圍子斷陷營城組火山巖氣藏上覆巖層的巖性、物性、空間位置及厚度等差異分佈規律，確定瞭火山巖天然氣蓋層的類型及劃分標準，探討瞭各類型蓋層的空間分佈規律、天然氣封閉性及其對氣藏髮育控製作用的差異性。分析結果錶明，徐傢圍子斷陷營城組火山巖天然氣藏蓋層具有3種類型：Ⅰ型為頂部泥巖蓋層，Ⅱ型為頂部緻密火山巖蓋層，Ⅲ型為上部緻密火山巖夾層蓋層。其中，Ⅱ型和Ⅲ型蓋層巖性均含有火山鎔巖及火山碎屑巖兩類巖性，且伽馬及密度測井麯線都顯示高值特徵；二者測井響應主要區彆在于空間分佈位置上的差異，Ⅱ型蓋層位于火山巖頂部，而Ⅲ型蓋層則位于火山巖段上部，其上還覆蓋低密度火山巖段。Ⅱ型蓋層覆蓋麵積大，空間連續性好，排替壓力最大可達8.8 MPa，相同蓋層厚度條件下所對應單井日產氣量最高，可達36.6×104 m3；Ⅰ型蓋層覆蓋麵積次之，且主要髮育在斷陷邊部地區，排替壓力最大為6.9 MPa，覆蓋範圍內單井日產氣量最高為23.2×104 m3；而Ⅲ型蓋層分佈區域內緻密封蓋層之間空間連續性較差，蓋層排替壓力大部分在4.75 MPa以內，單井日產氣量最高僅為12.8×104 m3。Ⅱ型蓋層對天然氣具有更彊的封蓋作用，Ⅰ型蓋層次之，Ⅲ型蓋層封蓋能力最差。各類型蓋層封蓋能力的差異性控製著火山巖氣藏的形成與富集。
통과분석송료분지서가위자단함영성조화산암기장상복암층적암성、물성、공간위치급후도등차이분포규률，학정료화산암천연기개층적류형급화분표준，탐토료각류형개층적공간분포규률、천연기봉폐성급기대기장발육공제작용적차이성。분석결과표명，서가위자단함영성조화산암천연기장개층구유3충류형：Ⅰ형위정부니암개층，Ⅱ형위정부치밀화산암개층，Ⅲ형위상부치밀화산암협층개층。기중，Ⅱ형화Ⅲ형개층암성균함유화산용암급화산쇄설암량류암성，차가마급밀도측정곡선도현시고치특정；이자측정향응주요구별재우공간분포위치상적차이，Ⅱ형개층위우화산암정부，이Ⅲ형개층칙위우화산암단상부，기상환복개저밀도화산암단。Ⅱ형개층복개면적대，공간련속성호，배체압력최대가체8.8 MPa，상동개층후도조건하소대응단정일산기량최고，가체36.6×104 m3；Ⅰ형개층복개면적차지，차주요발육재단함변부지구，배체압력최대위6.9 MPa，복개범위내단정일산기량최고위23.2×104 m3；이Ⅲ형개층분포구역내치밀봉개층지간공간련속성교차，개층배체압력대부분재4.75 MPa이내，단정일산기량최고부위12.8×104 m3。Ⅱ형개층대천연기구유경강적봉개작용，Ⅰ형개층차지，Ⅲ형개층봉개능력최차。각류형개층봉개능력적차이성공제착화산암기장적형성여부집。
Through analyzing the lithology , physical properties and spatial locations of the rocks overlying volcanic gas reservoirs,this paper investigated the types of cap rock and identification marks of each type in the Yingchen Formation of Xujiaweizi fault-Depression ,and then discussed the spatial distribution ,sealing ability and control on the formation of gas reservoirs of each cap rock type .The results showed that there were three types cap rocks of volcanic gas reservoirs in the Yingchen Formation of Xujiaweizi fault-Depression:typeⅠis mudstone cap rock overlying just on the top of volcanic gas reservoirs;typeⅡis compact volcanic cap rock located at the top of volcanic reservoirs;and type Ⅲis compact volcanic cap rock interbedded with loose volcanic rocks in the upper section of volcanic reservoirs .TypeⅡand typeⅢcap rocks are mainly consisted of volcanic lava and pyroclastic rock .Both type Ⅱand type Ⅲcap rocks show high gamma-ray de-flections and high density .The main difference between these two types of cap rocks is spatial distribution .The type Ⅱcap rock is located at the top of volcanic reservoirs ,while the type Ⅲcap rock is located at the upper part of volcanic res-ervoirs and usually covered by volcanic rocks with low density .The typeⅡcap rock had the widest distribution area and best spatial continuity than the others .The displacement pressures of type Ⅱcap rock was up to 8.8 MPa and single well daily gas production in reservoirs with this type of cap rocks is the highest ( up to 36.6 ×104 m3 ) in comparison with the other two types of cap rocks with the same thickness .The type Ⅰ cap rock has a smaller distribution area than type Ⅱand it is mainly distributed in the edge regions of fault-depression .Its displacement pressures is up to 6.9 MPa and the highest single well daily gas production in areas with this type of cap rocks could reach 23.2 ×104 m3 .The spatial conti-nuity of type Ⅲcap rock was poor and its displacement pressures was usually under 4.75 MPa,resulting in the highest daily gas production of one weⅡonly of 12.8 ×104 m3 in the distribution area of type Ⅲcap rock.Comprehensive analy-sis showed that type Ⅱcap rock had the best sealing ability among all cap rock types ,sealing ability of type Ⅲcap rock was the worst ,and that of type Ⅱcap rock was moderate .This difference of sealing ability among three types of cap rocks controlled the formation and enrichment of volcanic gas reservoirs .
