Geologic Comprehensive Evaluation Of Well Block Heidil In Changling Fault Depression

Heidimiao sag is the largest and deepest sag of Changling fault depression, wherevolcanic rocks are widely and deeply distributed, and huge potential for gas exploration. Inorder to definite petroleum resources potential in deep volcanic rocks of Heidimiao sag, weapplied logging, seismic, analysis testing materials to explore reservoir formation conditionsof deep volcanic rocks in the region, and then, we pointed out the loss factors for the volcanicrocks of well heidi1. Firstly, structural evolution history of seismic profile which is acrosswell Heidi1was resumed, what's more, we confirmed the current bound between YingchengFormation and Denglouku Formation; deep source rocks of Heidimiao sag was qualitativelyevaluated; we adjusted identification of volcanic rocks division by division, recognized typeof diagenesis and reservoir space, and classified fissures and reservoir integratively; quality ofcap rocks at the bottom of Denglouku Formation was estimated from both macroscopic andmicrocosmic levels; finally, we studied time-space relationships between each reservoirformation factors. The article shows that source rock of Yingcheng Formation andHuoshiLing Formation has poor organic matter and inferior type, and it is in post matureperiod, so hydrocarbon generation potential of this source rock is low, besides, it mismatcheswith trap and fault activities as well; the type of volcanic reservoirs is Ⅳ chiefly, whilefissure is Ⅰ and Ⅱ, so the study formation has thick fissure-reservoirs; mudstone cap rocksat the bottom of Denglouku Formation, which was broken by faults, is with low displacementpressure, good physical property and poor seal ability. In a word, poor sealing condition andunfavorable source rock are main lose factors for deep volcanic rocks of well heidi1, so thefollowing exploration work should definite hydrocarbon generation potential of ShaheziFormation firstly, and then, On the premise of ensuring that cap rocks was not influenced bydiscordogenic faults, favorable structure and targets could be optimized and located.