CAJ | 학술논문

东营凹陷古近系存在3类超高压地层.根据"综合压实曲线"和"压力正演模拟",确定欠压实和生烃作用是泥岩超高压的成因."接触传递"使与超高压泥岩呈接触关系的Ⅰ类砂岩产生超高压,Ⅱ类超高压砂岩则是"连通传递"的结果.沙三中亚段较深井段泥岩发育弱超高压,沙三下亚段压力增强到中超高压,沙四段发育强超高压.泥岩超高压平面上以沉积中心为超高压中心,向盆地边缘超高压强度减弱,呈"环状分布";浅层砂岩(埋深小于3 000 m)极少发育超高压,只分布在部分断裂带、不整合面附近,砂岩超高压强度大于泥岩;3 000 m以下,泥岩超高压强度大于砂岩.
동영요함고근계존재3류초고압지층.근거"종합압실곡선"화"압력정연모의",학정흠압실화생경작용시니암초고압적성인."접촉전체"사여초고압니암정접촉관계적Ⅰ류사암산생초고압,Ⅱ류초고압사암칙시"련통전체"적결과.사삼중아단교심정단니암발육약초고압,사삼하아단압력증강도중초고압,사사단발육강초고압.니암초고압평면상이침적중심위초고압중심,향분지변연초고압강도감약,정"배상분포";천층사암(매심소우3 000 m)겁소발육초고압,지분포재부분단렬대、불정합면부근,사암초고압강도대우니암;3 000 m이하,니암초고압강도대우사암.
There exist three types of over-pressured formations of Paleogene in Dongying sag.The undereompaction and hydrocarbon generation are the genetic mechanism of mudstone overpressure,according to the synthetic compaction curve and pressure forward modeling.The contact transmission leads to the overpressure of type-Ⅰ sandstone contacting over-pressured mudstone,while the connecting transmission is the cause of forming overpressure of type-Ⅱ sandstone.It is shown that weak overpressure occurs in mudstone in deeper well interval of Middle Sha-3 member,middle overpressure in Lower Sha-3 member and high overpressure in Sha-4 member.The mudstone pressure center depends on the sedimentary center,so the intensity of overpressure is decreasing toward the basin margin and distributed circularly.There is little overpressure in shallow sandstone less than 3 000 m in depth,except for its part distribution near the fault zone and unconformity,and the overpressure intensity of the sandstone is greater than that of the mudstone.In depth of over 3 000 m,such an intensity of the sandstone is smaller than that of the mudstone.