石油实验地质
石油實驗地質
석유실험지질
EXPERIMENTAL PETROLEUM GEOLOGY
2015年
1期
47-52
,共6页
定量评价%超压成因%走滑压扭%增压带%郯庐断裂%辽东湾
定量評價%超壓成因%走滑壓扭%增壓帶%郯廬斷裂%遼東灣
정량평개%초압성인%주활압뉴%증압대%담려단렬%료동만
quantitative evaluation%origin of overpressure%strike-slip and compression-shear booster zone%Tan-Lu Fault%Liaodong Bay
郯庐断裂渤海海域锦州27段走滑压扭增压带JZ27－A井区沙三段储层内发育异常高压，压力系数平均值达1．5。其主要特征为：超压顶部有厚层泥岩封隔层、超压发育段颗粒碎裂作用强、发育范围及层位受增压带范围以及走滑压扭强烈发育期影响（仅在JZ27－A井区沙三段储层内发育）。其形成机制为：在东三末期到东二早期的郯庐断裂强烈右旋走滑作用下，在走滑压扭增压带JZ27－A井区形成应力强烈集中区，从而形成水平构造挤压应力，同时由于上覆厚层泥岩的存在，应力得不到有效释放而产生超压。依据地层压力平衡，对走滑应力所产生的超压贡献进行了定量估算。计算结果表明，走滑应力对超压的贡献达到了30％～35％，早于大量生排烃期，极大地阻碍了油气充注。
郯廬斷裂渤海海域錦州27段走滑壓扭增壓帶JZ27－A井區沙三段儲層內髮育異常高壓，壓力繫數平均值達1．5。其主要特徵為：超壓頂部有厚層泥巖封隔層、超壓髮育段顆粒碎裂作用彊、髮育範圍及層位受增壓帶範圍以及走滑壓扭彊烈髮育期影響（僅在JZ27－A井區沙三段儲層內髮育）。其形成機製為：在東三末期到東二早期的郯廬斷裂彊烈右鏇走滑作用下，在走滑壓扭增壓帶JZ27－A井區形成應力彊烈集中區，從而形成水平構造擠壓應力，同時由于上覆厚層泥巖的存在，應力得不到有效釋放而產生超壓。依據地層壓力平衡，對走滑應力所產生的超壓貢獻進行瞭定量估算。計算結果錶明，走滑應力對超壓的貢獻達到瞭30％～35％，早于大量生排烴期，極大地阻礙瞭油氣充註。
담려단렬발해해역금주27단주활압뉴증압대JZ27－A정구사삼단저층내발육이상고압，압력계수평균치체1．5。기주요특정위：초압정부유후층니암봉격층、초압발육단과립쇄렬작용강、발육범위급층위수증압대범위이급주활압뉴강렬발육기영향（부재JZ27－A정구사삼단저층내발육）。기형성궤제위：재동삼말기도동이조기적담려단렬강렬우선주활작용하，재주활압뉴증압대JZ27－A정구형성응력강렬집중구，종이형성수평구조제압응력，동시유우상복후층니암적존재，응력득불도유효석방이산생초압。의거지층압력평형，대주활응력소산생적초압공헌진행료정량고산。계산결과표명，주활응력대초압적공헌체도료30％～35％，조우대량생배경기，겁대지조애료유기충주。
In the JZ27-A well block of the strike-slip and compression-shear booster zone in the JZ27 section of the Liaodong Bay in the Bohai Sea area of the Tan-Lu Fault, overpressure developed in the third member of the Shahejie Formation, and the pressure coefficient reached an average of 1.5. Thick mudstones sealed the overpres?sure on the top. Particle fragmentation was obvious in the overpressure zone. The area and thickness of the over?pressure were controlled by the range of the pressure booster zone and the intense development of strike-slip and compression-shear zone, mainly restricted to the third member of the Shahejie Formation in the JZ27-A well block. The origin for overpressure was interpreted to be as follows. From the end of the third member of the Dongying Formation to the early stage of the second member of the Dongying Formation, influenced by the in?tense dextral strike-slip of the Tan-Lu Fault, stress concentrated in the JZ27-A well block of the strike-slip and compression-shear booster zone. Thereby, horizontal structural compression stress formed. At the same time, be?cause of overlying thick?bedded mudstones, stress could not be released effectively. As a result, overpressure oc?curred. According to the balance of reservoir pressure, the contribution of strike-slip stress to overpressure was quantitatively evaluated. The contribution of strike-slip stress to overpressure was 30%-35% and occurred earlier than the period with large amounts of hydrocarbon generation and expulsion. The overpressure impeded the charging of oil tremendously.
