珠江口盆地东部陆架坡折带PY35-2气藏地质地球物理综合研究
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摘要
PY35-2位于珠江口盆地东部番禺-流花天然气区向南部深水区白云凹陷过渡的陆架坡折带上,主要目的层段珠江组下段上部(SQzj2-T50)为受多条断层切割的陆架边缘三角洲低位楔沉积,其上覆沉积地层为巨厚的浅海陆棚泥,储、盖组合条件较好。2007年年底,中海石油深圳分公司根据项目组的研究成果,对PY35-2圈闭主体部位实施了钻探。通过钻探,在其主要目的层段珠江组下段上部获得了非常好的、厚层状的优质天然气层,证实了PY35-2及其所在陆架坡折带领域良好的天然气勘探前景。
     陆架坡折带由于其独特的沉积环境,往往造成其在时间域的畸变而让人琢磨不透。纵观国内外的研究,虽然取得了许多丰硕成果,但研究难度依旧较大,是目前世界性的研究难点和前沿课题。
     PY35-2钻探效果使我们深深地认识到其复杂性,致使我们对PY35-2气藏的深入评价面临诸多严峻挑战:沉积、构造和含气AVO属性等。在珠江口盆地东部白云凹陷北坡陆架坡折带领域类似PY35-2气藏的圈闭众多,深入加强对PY35-2气藏的沉积属性、构造属性和AVO属性等地质地球物理综合研究,不但使我们能加深对PY35-2气藏的认识,还会使我们对珠江口盆地东部白云凹陷北坡陆架坡折带领域其它类似PY35-2气藏的目标圈闭日后评价起到指导作用。
     本次研究主要在以下几个方面有所突破:①井-震结合,根据地震沉积学分析原理,在区域层序地层及沉积相研究基础上,结合古构造地貌和海平面变化以及沉积物分散体系对沉积层序发育演化控制作用的研究,确定PY35-2气藏的沉积属性;②鉴于现有地震资料分辨率问题,采用叠后高频拓展处理(Highfrequency expanding,简称HFE)和基于小波边缘分析建模的声阻抗反演(Acousticimpedance inversion with wavelet analysis,简称AIW),落实PY35-2气藏沉积属性的边界,结合叠前深度偏移(PSDM)处理,厘定PY35-2气藏深度构造属性;③井-震结合,开展针对天然气的叠前AVO三属性(密度ρ、体积模量κ、μ剪切模量)反演,确定PY35-2气藏的AVO三属性特征及其平面变化;④根据PY35-2的沉积属性、构造属性和AVO三属性等研究成果,综合确定PY35-2气藏的含气范围;⑤形成一套针对珠江口盆地东部陆架坡折带领域天然气勘探地质地球物理综合研究技术组合系列:沉积→构造→AVO→综合评价。
     地质地球物理综合研究是目前油气勘探发展的一个重要方向,本文针对珠江口盆地东部陆架坡折带领域PY35-2气藏地质地球物理综合研究,理出了一个较清晰的思路,但在不同领域、不同地区的油气勘探实践中的应用尚需进一步研究和完善。
PY35-2locates at slope break from PANYU-LIUHUA gas area of eastern pearlriver mouth basin to deep water area of southern BAIYUN depression. The upper partof the lower member of ZHUJIANG formation, the mainly target strata, covered byhuge thick shallow sea shelf mud, is low-stand wage deposition at shelf edge delta andis cut by different geologic period faults. Therefore, the formation is of goodreservoir-cap combination condition. In the end of2007, Shenzhen Branch ofCNOOC drilled at the principal portion of PY35-2trap based on research results. Bydrilling, good quality and thick gas layer is found in the upper part of the lowermember of ZHUJIANG formation, which prove PY35-2and shelf slope break regionare of good prospect.
     Because of unique sedimentary environment, shelf slope break region is oftendistorted in time domain and researchers are puzzled. Taking a wide view of thedomestic and foreign researches, though rich achievements have gotten, research onshelf slope break region is still very difficult and is a worldwide leading edgeproblem.
     Drilling results of PY35-2make us aware of its complexity and face many severechallenges when evaluate gas reservoir deeply such as structure, deposition, and AVOattributes etc. There are many traps like PY35-2in shelf slope break region, northslope of BAIYUN depression, eastern pearl river mouth basin. Deeply geological andgeophysical integrate research on structure, deposition, and AVO attributes of PY35-2is not only deepen our understanding of this gas reservoir, but also guide us toevaluate other similar gas reservoirs in shelf slope break region, north slope ofBAIYUN depression, eastern pearl river mouth basin.
     This study have the following breakthrough:①combining well and seismic,applying principle of seismic sedimentology, integrating research on controllingaction to sedimentary sequence development and evolution from paleo tectonic, sealevel change and sediment dispersion system, sedimentary attribute of PY35-2gas reservoir is determined.②In view of low resolution of seismic data, post-stackHFE frequency-extending and AIW impedance inversion are adopted to determinesedimentary attribute edges of PY35-2gas reservoir. Combined result of pre-stackdepth migration processing, depth structure attribute is given.③combining well andseismic, making pre-stake AVO three attributes(ρ、κ、μ) inversion to get AVOthree attributes’ character and their planar change.④integrating sedimentary attribute,structure attribute, and AVO three attributes to determine bound of gas of PY35-2gasreservoir.⑤A series of geological and geophysical techniques aiming at shelf slopebreak region, north slope of BAIYUN depression, eastern pearl river mouth basin areshaped, that is, sedimentary→structure→AVO→integrating evaluation.
     Geological and geophysical integrating research is an important direction. Basedon geological and geophysical integrating research on PY35-2gas reservoir, shelfslope break region, eastern pearl river mouth basin, a clear route is given. However,its application in different fields and different areas need to be studied andconsummated more deeply.
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