罗151井区侵入岩油藏储集层分布及成藏特征

罗 151井区位于沾化凹陷南部 ,沙三段辉绿岩稀油油藏是近年来济阳坳陷在下第三系发现、勘探开发效果最好的侵入岩油藏。该辉绿岩为岩盘型浅成侵入岩 ,大致在东营组沉积末期和馆陶组沉积中期两期顺层侵入于沙三段烃源岩中 ,有 4个亚相 :炭质板岩亚相 ,含堇青石硅灰石角岩亚相 ,边缘亚相 ,中心亚相。通过人机联作解释技术抽取联井地震测线、制作合成地震记录 ,提取了 2 0种地震特征参数 ,采用神经网络判识技术识别火成岩 ,编制出火成岩等厚图和顶面、底面构造图。该辉绿岩圈闭及储集空间 (原生的裂缝系统及晶间孔隙和次生的溶蚀孔、洞、拱张缝等 )的形成早于生油期 ,有良好的油源条件 ,烃源岩也是封盖层 ,断层及围岩中的微裂缝是主要油气运移通道 ,形成了硅灰石角岩微孔隙型油藏和辉绿岩孔隙 裂缝型油藏两种油藏类型。图 3参 3(王孝陵摘 )

Characteristics of distribution and reservoir forming of the intrusive oil reservoir in Well-block Luo-151

Well-block Luo-151 is located at the southern part of Zhanhua sag. A light oil reservoir in diabase is discovered recently in Member S 3 of the Lower Tertiary in Jiyang depression, which is an intrusive oil reservoir with better exploration and development results. This diabase is laccolith type shallow intrusive rocks, it intruded along bedding planes in Member S 3 hydrocarbon origin formations in the late of the deposition period of Dongying Formation and the middle of that of Guantao Formation. There are 4 subfacies: carbonaceous slate subfacies, hornfels subfacies containing cordierite and grammite, border subfacies and central subfacies. By man-computer interaction technique, data are selected from crossing-well seismic lines to construct synthetic seismic records, and 20 seismic characteristic parameters are taken to identify igneous rocks by neural network techniques to construct the structural map of their top and bottom. This diabase oil trap and porous space (primary fracture systems, intercrystalline pores and those secondary dissolution pores, caves and fissures due to arching etc.) are formed early than the period of oil generation. There are good oil sources, and the source formations are good caprocks also. Faults and microcracks in the wall-rock act as the pathways for oil and gas migration, grammite-hornfels micropore type and diabase porous-fracture type oil reservoirs are formed.